Determine if the function is a polynomial function. If the function is a polynomial function, state the degree and leading coefficient. If the function is not a polynomial, state why. f(x)=x^4(2-x^3)+1
Answers
Answer:
The correct option is
This is a polynomial function of degree 7 with a leading coefficient of -1
Step-by-step explanation:
Functions that consist of a variable such as x raised to positive integer powers which are equal to or larger than zero added together to make the function are known as polynomial functions
Therefore, the function in the question which is f(X) = x⁴ × (2 - x³) + 1
Which can be expanded as follows
f(x) = 2·x⁴ - x⁷ + 1, which is the same as given as follow equation;
f(x) = -x⁷ + 2·x⁴ + 1
Which is polynomial function with a leading coefficient of -1 as it consists of only whole number positive powers of x including the powers of x 4 and 7
Therefore, the correct option is that f(x) is a polynomial function of degree 7 with a leading coefficient of -1.
Related Questions
Where is the function increasing?
A)1
B)3< X
C)-infinity < x < 1
D)-infinity
Answers
Answer:
A) [tex]1<x<\infty[/tex]
Step-by-step explanation:
Given:
A graph of a function.
When we analyze the given graph, it is of a parabola.
To find:
The interval of values of [tex]x[/tex] where the function is increasing.
Solution:
First of all, let us learn about the meaning of increasing and decreasing functions.
1. A function [tex]y=f(x)[/tex] is known as increasing in an interval [tex]a<x<b[/tex] when
Value of y keeps on increasing when we move from the value of x from a to b.
2. A function [tex]y=f(x)[/tex] is known as decreasing in an interval [tex]a<x<b[/tex] when
Value of y keeps on decreasing when we move from the value of x from a to b.
On analyzing the given graph , we can see that the graph is decreasing on the interval: [tex]-\infty<x<1[/tex]
and is increasing on the interval: [tex]1<x<\infty[/tex]
When we choose from the options,
The correct answer is option A) [tex]1<x<\infty[/tex]
Given f(x) = 3x - 1 and g(x) = 2x + 1, find (f +g)(3)
Answers
Answer:
(f + g)(3) = 15Step-by-step explanation:
f(x) = 3x - 1
g(x) = 2x + 1
To find (f +g)(3) , first find (f + g)(x)
To find (f + g)(x) add g(x) to f(x)
That's
(f + g)(x) = 3x - 1 + 2x + 1
= 3x + 2x + 1 - 1
(f + g)(x) = 5x
Now to find (f + g)(3) substitute 3 into
(f + g)(x)
That's
(f +g)(3) = 5(3)
(f + g)(3) = 15Hope this helps you
A lead ball weighs 326 grams. Find the radius of the ball to the nearest tenth of a
centimeter.
Answers
Answer:
1.9cm
Step-by-step explanation:
The density d of a material is related to its mass m and volume V as follows;
d = [tex]\frac{m}{V}[/tex] ------------------(i)
The material in question here is the lead ball.
Now, from known experiment;
the density of lead is 11.34g/cm³
From the question, the weight/mass of the lead ball is 326g
Substitute these values into equation (i) as follows;
11.34 = [tex]\frac{326}{V}[/tex]
V = [tex]\frac{326}{11.34}[/tex]
V = 28.75cm³
Now, since the ball is of course spherical, we can get the radius by using the following relation from the volume of a sphere;
V = [tex]\frac{4}{3} \pi r^3[/tex] [V = volume, r = radius]
V = 28.75cm³
=> 28.75 = [tex]\frac{4}{3} \pi r^3[/tex]
=> 3 x 28.75 = 4 π r³
=> 86.25 = 4 π r³
=> 21.5625 = π r³ [Take π = 3.142]
=> 21.5625 = (3.142) r³ [divide both sides by 3.142]
=> 6.86 = r³ [Take the cube root of both sides]
=> ∛6.86 = ∛r³
=> 1.90 = r
Therefore, the radius is 1.9cm to the nearest tenth
Explain how to sketch a graph of the function f(x) = x3 + 2x2 – 8x. Be sure to include end-behavior, zeroes, and intervals where the function is positive and negative.
Answers
Answer:
Step-by-step explanation:
First, for end behavior, the highest power of x is x^3 and it is positive. So towards infinity, the graph will be positive, and towards negative infinity the graph will be negative (because this is a cubic graph)
To find the zeros, you set the equation equal to 0 and solve for x
x^3+2x^2-8x=0
x(x^2+2x-8)=0
x(x+4)(x-2)=0
x=0 x=-4 x=2
So the zeros are at 0, -4, and 2. Therefore, you can plot the points (0,0), (-4,0) and (2,0)
And we can plug values into the original that are between each of the zeros to see which intervals are positive or negative.
Plugging in a -5 gets us -35
-1 gets us 9
1 gets us -5
3 gets us 21
So now you know end behavior, zeroes, and signs of intervals
Hope this helps
The zeroes of the function are -4, 0 and 2.
The intervals where the function is positive is [tex]-4 < x < 2, \ \ x >2[/tex].
The intervals where the function is negative is [tex]x < -4[/tex].
The given parameters:
f(x) = x³ + 2x² - 8xWhat is zeroes of a function?The zeroes of a function is the possible values of the unknown that makes the entire function to be zero.
The zeroes of the cubic equation is calculated as follows;
f(x) = 0
x³ + 2x² - 8x
factorize as follows;
[tex]x(x^2 + 2x -8) = 0\\\\x(x^2 + 4x - 2x -8) = 0\\\\x[x (x + 4 )-2(x + 4)]= 0\\\\x(x + 4)(x -2)=0\\\\x = 0, \ \ x = -4 \ \ x = 2[/tex]
The intervals where the function is positive and negative is determined as follows;
[tex]x(x + 4) (x - 2)\\\\[/tex]
[tex]when, \ x = -5, \ f(x) = -ve\\\\when, \ x = -4, \ f(x) =0\\\\when , \ x = -3, \ f(x) = +ve[/tex]
The intervals where the function is positive is determined as;
[tex]-4 < x < 2, \ \ x >2[/tex]
The intervals where the function is negative is determined as;
[tex]x < -4[/tex]
Learn more about graph of cubic equation here: https://brainly.com/question/8878887
Please Help!!!!
Which statement is true about the end behavior of the graphed function?
A: As the x-values go to positive infinity, the function's values go to negative infinity.
B: As the x-values go to zero, the function's values go to positive infinity.
C: As the x-values go to negative infinity, the function's values are equal to zero.
D: As the x-values go to negative infinity, the function's values go to positive infinity.
Answers
Answer:
D: As the x-values go to negative infinity, the function's values go to positive infinity.
Step-by-step explanation:
Since we are dealing with end behavior, we look at the graph infinitely:
When x-values go to negative infinity, we see that f(x) values go to positive infinity.
When x-values go to positive infinity, we see that f(x) values also go to positive infinity.
Therefore. our only correct answer is D.
Please answer it in two minutes
Answers
Answer:
2√3
Step-by-step explanation:
Since this is a 30-60-90 triangle, we can find s by finding the short leg (bottom), then the hypotenuse (s).
To find the short leg, we can divide the long leg (which is 3mm) by sqrt 3 (also √3, as any of them are fine), and we will have 3/√3. Since we don't want the square root on the bottom, we can multiply √3 on both sides, giving us 3√3/3, which is technically √3 because of simplifying.
Since you have the short leg now, you can find s. By finding s, you can multiply the short leg by 2, which will be √3 * 2 which is 2√3.
Find the midpoint of the segment between the points (−5,13) and (6,4)
Answers
Answer:
(0.5, 8.5)
Step-by-step explanation:
use this formula ((x1+x2/2), (y1+y2/2)) if you use desmos graphing calculator and you type this formula in, all you have to do it put in the correct numbers and you get your midpoint.
Hope this helped :)
The midpoint of the segment between the points (−5,13) and (6,4) are (0.5 and 8.5)
We have given that, the points (−5,13) and (6,4)
We have to determine the midpoints
What is the formula for the midpoint?((x1+x2/2), (y1+y2/2))
x1=-5,x2=6,y1=13 and y2=4
-5+6/2=1/2=0.5
and next is,
13+4/2=17/2=8.5
The midpoint of the segment between the points (−5,13) and (6,4) are (0.5 and 8.5)
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Simplify: 34w-(-8w)
Answers
Answer: 42w
Step-by-step explanation:
Subtracting a negative is like adding.
Since two negatives equal a positive.
Pam works as an office administrator. She spends $7500 of her income on personal expenses each year. If this represents 18% of her salary, how much money does Pam earn in one year? Round your answer to the nearest whole dollar.
Answers
Answer:
Her annual salary is approximately $41,667
Step-by-step explanation:
Hello,
This question deals with percentage of a number and it's very easy :)
First of all, get the data and understand what's required of us.
Pam spends $7500 yearly on expenses
But this amount represents 18% of her annual income.
Let her annual income be represented by x
18% = 7500 / x
18÷100 = 7500÷x
cross multiply and solve for x
18 × x = 7500 × 100
18x = 750,000
divide both sides by 18
18x / 18 = 750,000 / 18
x = $41,666.67
x = $41,667
Her annual salary is approximately $41,667
Find the measure of one exterior angle in each regular polygon.
Answers
Answer:
72° and 45°
Step-by-step explanation:
The sum of the exterior angles of a polygon = 360°
Since the given polygons are regular, then
Pentagon (5 sides ) has
exterior angle = 360° ÷ 5 = 72°
Octagon ( 8 sides ) has
exterior angle = 360° ÷ 8 = 45°
Step-by-step explanation:
The exterior angle of a polygon is given by
360/n
where n is the number of sides
First figure
For the first shape it has five sides
That's it's a pentagon
The measure of one exterior angle of the shape is
360 / 5
= 72°
Second figure
For the second shape it has 8 sides that's it's an octagon
So the measure of one exterior angle of the shape is
360 / 8
= 45°
Hope this helps you
In a certain group of students, the probability of a randomly-chosen student being male is 40%, the probability of the student studying Spanish is 18%, and the probability of the student being a male who studies Spanish is 5%. What’s the probability of the student being a male, if you know the student studies Spanish
Answers
Answer:
27.8%
Step-by-step explanation:
P(male | Spanish) = P(male and Spanish) / P(Spanish)
P(male | Spanish) = 0.05 / 0.18
P(male | Spanish) = 0.278
The probability of the student being a male is 27.8%
What is probability?Probability is defined as the ratio of the number of favorable outcomes to the total number of outcomes in other words the probability is the number that shows the happening of the event.
Probability = Number of favorable outcomes / Number of sample
Given that in a certain group of students, the probability of a randomly-chosen student being male is 40%, the probability of the student studying Spanish is 18%, and the probability of the student being a male who studies Spanish is 5%.
The probability of the student being a male will be calculated as below:-
P(male | Spanish) = P(male and Spanish) / P(Spanish)
P(male | Spanish) = 0.05 / 0.18
P(male | Spanish) = 0.278
Therefore, the probability of the student being a male is 27.8%
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Find the value.
X3-4 when x=3
PLEASE HELP!!! ASAP!!!
Answers
Answer:
23
Step-by-step explanation:
Raise 3 to the power of 3
27 - 4
Subtract 4 from 27
23
Hope this was correct
Answer:
23
Explanation:
step 1 - rewrite the expression with the value of x
[tex]x^3 - 4[/tex]
[tex](3)^3 - 4[/tex]
step 2 - solve the exponent
[tex](3)^3 - 4[/tex]
[tex]27 - 4[/tex]
step 3 - subtract
[tex]27 - 4[/tex]
[tex]23[/tex]
therefore, the value of the expression is 23.
The length of a rectangle is 7 meters longer than its width. What is the width of this rectangle if its perimeter is equal to 86 meters?
Answers
Answer:
18 meters
Step-by-step explanation:
If the width is w, the length is w + 7.
Perimeter = 2(width + length), therefore:
86 = 2(w + w + 7)
86 = 2(2w + 7)
43 = 2w + 7
36 = 2w
w = 18
Answer:
18 metersStep-by-step explanation:
Given,
Let length of a rectangle be ' x + 7 ' meters
Let width of a rectangle be ' x ' meters
Perimeter = 86 meters
Now, let's find the width of the rectangle:
Perimeter of rectangle = [tex]2(l + b)[/tex]
plug the values
[tex]86 = 2(x + 7 + x)[/tex]
Collect like terms
[tex]86 = 2(2x + 7)[/tex]
Distribute 2 through the parentheses
[tex]86 = 4x + 14[/tex]
Move constant to R.H.S and change its sign
[tex]86 - 14 = 4x[/tex]
Calculate the difference
[tex]72 = 4x[/tex]
Swipe the sides of the equation
[tex]4x = 72[/tex]
Divide both sides of the equation by 4
[tex] \frac{4x}{4} = \frac{72}{4} [/tex]
Calculate
[tex]x = 18[/tex] meters
Hope this helps..
Best regards!!
A point H is 20m away from the foot of a tower on the same horizontal ground. From the point H, the angle of elevation of the point (P) on the tower and the top(T) of the tower are 30° and 50° respectively.
( a) draw a diagram to illustrate the information above.
(b) calculate correct to 3 s.f,
( I) /PT/
(ii) the distance between H and the too of the tower.
(III) the position of H if the angle of depression of H from the too of the tower is to be 40°
Answers
Answer:
a. See Attachment 1
b. [tex]PT = 12.3\ m[/tex]
c. [tex]HT = 31.1\ m[/tex]
d. [tex]OH = 28.4\ m[/tex]
Step-by-step explanation:
Calculating PT
To calculate PT, we need to get distance OT and OP
Calculating OT;
We have to consider angle 50, distance OH and distance OT
The relationship between these parameters is;
[tex]tan50 = \frac{OT}{20}[/tex]
Multiply both sides by 20
[tex]20 * tan50 = \frac{OT}{20} * 20[/tex]
[tex]20 * tan50 = OT[/tex]
[tex]20 * 1.1918 = OT[/tex]
[tex]23.836 = OT[/tex]
[tex]OT = 23.836[/tex]
Calculating OP;
We have to consider angle 30, distance OH and distance OP
The relationship between these parameters is;
[tex]tan30 = \frac{OP}{20}[/tex]
Multiply both sides by 20
[tex]20 * tan30 = \frac{OP}{20} * 20[/tex]
[tex]20 * tan30 = OP[/tex]
[tex]20 * 0.5774= OP[/tex]
[tex]11.548 = OP[/tex]
[tex]OP = 11.548[/tex]
[tex]PT = OT - OP[/tex]
[tex]PT = 23.836 - 11.548[/tex]
[tex]PT = 12.288[/tex]
[tex]PT = 12.3\ m[/tex] (Approximated)
--------------------------------------------------------
Calculating the distance between H and the top of the tower
This is represented by HT
HT can be calculated using Pythagoras theorem
[tex]HT^2 = OT^2 + OH^2[/tex]
Substitute 20 for OH and [tex]OT = 23.836[/tex]
[tex]HT^2 = 20^2 + 23.836^2[/tex]
[tex]HT^2 = 400 + 568.154896[/tex]
[tex]HT^2 = 968.154896[/tex]
Take Square Root of both sides
[tex]HT = \sqrt{968.154896}[/tex]
[tex]HT = 31.1\ m[/tex] (Approximated)
--------------------------------------------------------
Calculating the position of H
This is represented by OH
See Attachment 2
We have to consider angle 50, distance OH and distance OT
The relationship between these parameters is;
[tex]tan50 = \frac{OH}{OT}[/tex]
Multiply both sides by OT
[tex]OT * tan50 = \frac{OH}{OT} * OT[/tex]
[tex]OT * tan50 = {OH[/tex]
[tex]OT * 1.1918 = OH[/tex]
Substitute [tex]OT = 23.836[/tex]
[tex]23.836 * 1.1918 = OH[/tex]
[tex]28.4= OH[/tex]
[tex]OH = 28.4\ m[/tex] (Approximated)
Select the correct answer.
What is the exact solution to the system of equations shown on the graph?
Answers
Answer:
Option (B)
Step-by-step explanation:
There are two lines on the graph representing the system of equations.
First line passes through two points (-3, 1) and (-2, 3).
Slope of the line = [tex]\frac{y_2-y_1}{x_2-x_1}[/tex]
= [tex]\frac{3-1}{-2+3}[/tex]
m = 2
Equation of the line passing through (x', y') and slope = m is,
y - y' = m(x - x')
Equation of the line passing through (-3, 1) and slope = 2 will be,
y - 1 = 2(x + 3)
y = 2x + 7 ----------(1)
Second line passes through (0, 1) and (-1, 4) and y-intercept 'b' of the line is 1.
Let the equation of this line is,
y = mx + b
Slope 'm' = [tex]\frac{y_2-y_1}{x_2-x_1}[/tex]
= [tex]\frac{4-1}{-1-0}[/tex]
= -3
Here 'b' = 1
Therefore, equation of the line will be,
y = -3x + 1 ---------(2)
From equation (1) and (2),
2x + 7 = -3x + 1
5x = -6
x = [tex]-\frac{6}{5}[/tex]
x = [tex]-1\frac{1}{5}[/tex]
From equation (1),
y = 2x + 7
y = [tex]-\frac{12}{5}+7[/tex]
= [tex]\frac{-12+35}{5}[/tex]
= [tex]\frac{23}{5}[/tex]
= [tex]4\frac{3}{5}[/tex]
Therefore, exact solution of the system of equations is [tex](-1\frac{1}{5},4\frac{3}{5})[/tex].
Option (B) will be the answer.
Answer:
B. (-1 1/5, 4 3/5)
Step-by-step explanation:
4^6 • 4^-8 pls answer
Answers
Answer:
[tex]\boxed{4^{-2}}[/tex]
Step-by-step explanation:
[tex]4^6 \times 4^{-8}[/tex]
When bases are same for exponents and it is multiplication, then add the exponents.
[tex]4^{6+-8}[/tex]
[tex]4^{-2}[/tex]
Explanation: Since these two powers have the same base of 4, you can multiply them together by simply adding their exponents to get 4⁻².
When applying your exponent rules, the bases don't change!
Solve the inequality.
9p+23<41
Answers
Answer:
p < 2
Step-by-step explanation:
9p + 23 < 41
p < 2
Answer:
p < 2
Step-by-step explanation:
9p + 23 < 41
9p < 18
p < 2
A builder wrote the measurements needed for a door.
height of door
2032 mm
width or door
Why did the builder write these measurements using millimetres instead of cm or m?
Answers
Answer:
Check the answer below.
Step-by-step explanation:
This is a very trivial but professional question. Note that all of millimetre, centimetre and metres are acceptable metric units but the millimetre is more preferable by builders and architects because:
1. It is easier to work with integer values on building and architectural plans, an advantage given by measuring and recording in millimetre.
2. working in millimetre allows for precision. The builder will record values that are very close to the true value
3. The measurement will be easily readable by anybody that sees it.
I don't understand this factorisation
a2+ 4a+3
Answers
Answer:
[tex] \boxed{\sf (a + 3)(a + 1)} [/tex]
Step-by-step explanation:
[tex] \sf Factor \: the \: following: \\ \sf \implies {a}^{2} + 4a + 3 \\ \\ \sf The \: factors \: of \: 3 \: that \: sum \: to \: 4 \\ \sf are \: 3 \: and \: 1. \\ \\ \sf So, \\ \sf \implies {a}^{2} + (3 + 1)a + 3 \\ \\ \sf \implies {a}^{2} + 3a + a + 3 \\ \\ \sf \implies a(a + 3) + 1(a + 3) \\ \\ \sf \implies (a + 3)(a + 1) [/tex]
What are the independent and dependent variables in the relationship?
Answers
w is the width and it is the independent variable. You can pick any positive whole number you want (within reason of course; you can't go to infinity or go beyond some set boundary). Whatever you picked for w, the expression 2w-5 will be dependent on it. So the length is dependent on the width.
For instance, if the width is w = 10 feet, then 2w-5 = 2*10-5 = 20-5 = 15 feet is the length. The choice of 10 feet for the width directly affects the length being 15 feet.
Please help Asap!!!Math question
Answers
Answer:
first one
Step-by-step explanation:
please answer this A bicycle store costs $2400 per month to operate. The store pays an average of $60 per bicycle that is sold in the shop. This is called a company’s overhead. The average selling price of each bicycle is $120. How many bicycles must the store sell each month to break even? A bicycle store costs $2400 per month to operate. The store pays an average of $60 per bicycle that is sold in the shop. This is called a company’s overhead. The average selling price of each bicycle is $120. How many bicycles must the store sell each month to break even?
Answers
Answer: The store must sell 40 bikes.
Step-by-step explanation:
y=60x+2400
y=120x
120x=60x+2400
-60x on both sides
60x=2400
divide 60 on both sides
2400/60=40
x=40
What is f(x) = - 2x + 7 where x = - 5?
A) -3
B) 3
C) -7
D) 17
Answers
Answer:
answer is D
Step-by-step explanation:
f(x) = -2(-5) + 7
f(x) = 10 + 7 = 17
the solution is 17
The logistic growth function f(t)equals440 Over 1 plus 13.7 e Superscript negative 0.28 t EndFraction describes the population of a species of butterflies t months after they are introduced to a non-threatening habitat. How many butterflies are expected in the habitat after 20 months? Round to nearest whole number.
Answers
Answer:
8685 butterflies
Step-by-step explanation:
Given the logistics growth function expressed as f(t)equals440 Over 1 plus 13.7 e Superscript negative 0.28 t which describes the population of a species of butterflies t months after they are introduced to a non threatening habitat, to know the number of butterflies expected butterflies are expected in the habitat after 20 months, we will substitute t = 20 into the function.
f(20) = 440/1+13.7exp-(0.28×20)
f(20) = 440/1+13.7exp-(5.60)
f(20) = 440/1+(13.7× 0.003698)
f(20) = 440/1+0.05066
f(20) = 440/1.05066
f(20) = 8684.9
This means there will be approximately 8685 butterflies in the habitat after 20months.
Rewrite the equation of the circle (x + 2)^2 + (y + 5)^2 = 9 in general form.
Answers
Answer:
x² + 4x + y² + 10y + 20 = 0
Step-by-step explanation:
Step 1: Expand (x + 2)²
x² + 2x + 2x + 4 + (y + 5)² = 9
Step 2: Combine like terms
x² + 4x + 4 + (y + 5)² = 9
Step 3: Expand (y + 5)²
x² + 4x + 4 + y² + 5y + 5y + 25 = 9
Step 4: Combine like terms
x² + 4x + 4 + y² + 10y + 25 = 9
Step 5: Move 9 over
x² + 4x + 4 + y² + 10y + 25 - 9 = 0
Step 6: Combine like terms
x² + 4x + y² + 10y + 20 = 0
Answer:
x^2+y^2+4x+10y+20=0
Step-by-step explanation:
(x+2)^2+(y+5)^2=9
x^2+4x+4+y^2+10y+25-9=0
general form: x^2+y^2+4x+10y+20=0
Find a12 of the sequence 1/4,7/12,11/12,5/4,
Answers
Answer:
Your ans is. a12 = 47/12
Step-by-step explanation:
First, you need to find if the series has a common ratio or a common difference between each term. Based from observation, there is a common difference of 1/3 so the series is an arithmetic series.
The solution for this problem goes like this
an=a1+(n-1)d
a12=1/n+(12-1)(1/3)
a12=47/12
Hope it helped you.. Please mark BRAINLIEST
Tysm
Jack had 4 hours of school. He spent 45 minutes in the library and 12 hour on a science lecture and had a lunch break of 25 minutes. How much time is left for the school to get over? (Write the answer as a fraction.)
Answers
Answer:
[tex]\dfrac{10}{4} \ hour[/tex]
Step-by-step explanation:
Given that :
Jack had 4 hours of school.
He spent 45 minutes in the library
1/2 hour on a science lecture and;
had a lunch break of 25 minutes
The objective is to determine how much time is left for the school to get over and we are to write the answer as a fraction.
In order to do that, we will have to convert the minutes into hours,
we all know that; 60 minutes = 1 hour.
Then,
45 minutes = (45/60)hour = 3/4 hour
25/60 minutes = 1/4 hour
Therefore, the amount of time left for the school to get over is:
= [tex]4 - (\dfrac{3}{4}+\dfrac{1}{2}+ \dfrac{1}{4})[/tex]
= [tex]\dfrac{16-(3+2+1)}{4}[/tex]
= [tex]\dfrac{16-6}{4}[/tex]
= [tex]\dfrac{10}{4} \ hour[/tex]
f(x) = x^2 - 4x + 3 f(x) = 1/2x + p The system of equations above, when graphed in the xy-coordinate plane, intersects at the point (4, q). What is p?
Answers
Answer:
p = 1
Step-by-step explanation:
Given that the system intersect at (4, q) then this point satisfies both equations, that is
q = 4² - 4(4) + 3
q = [tex]\frac{1}{2}[/tex] (4) + p
Equating both gives
16 - 16 + 3 = 2 + p, that is
3 = 2 + p ( subtract 2 from both sides )
p = 1
Samin can run 5 kilometers in 30 minutes. Assuming she keeps a constant pace, how many kilometers can she run in 45 minutes? URGENT ANSWERS PLEASE!
Answers
Answer:
7.5kilometer
Step-by-step explanation:
for 30mins semin runs 5kilometer
then for 1min: (1min×5kilometer)÷30mins,
therefore, for 45mins: (45mins×5kilometer)÷30mins=7.5kilometer
From the given information:
We are being informed that Samin can run for 5 kilometers in 30 minutes;
If Samin can run such a kilometer in 30 minutes;
5 kilometers = 30 minutes
∴
In x kilometers = 45 minutes
By cross multiplying;
(x × 30 minutes) = 5 kilometers × 45 minutes
30x = 225 kilometer/minutes
[tex]x = \dfrac{225 \ kilometer/minutes}{30 minutes}[/tex]
[tex]\mathbf{x = 7.5 \ kilometers}[/tex]
Therefore, we can conclude that the Samin can run 7.5 kilometers in 45 minutes.
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Para ingresar a la Universidad del Chocó se aplica una prueba de razonamiento que consta de 30 preguntas. Por cada respuesta correcta se asignan 5 puntos y por cada incorrecta (o no contestada) se restan 2 puntos. Si un participante obtuvo un puntaje de 94 puntos, ¿cuántas preguntas
Answers
Complete question:
Para ingresar a la Universidad del Chocó se aplica una prueba de razonamiento que consta de 30 preguntas. Por cada respuesta correcta se asignan 5 puntos y por cada incorrecta (o no contestada) se restan 2 puntos. Si un participante obtuvo un puntaje de 94 puntos, ¿cuantas preguntas respondió bien?
Responder:
número de respuestas correctas = 22
Explicación paso a paso:
Dado lo siguiente:
Número total de preguntas = 30
Deje respuestas correctas = y; Respuestas incorrectas = n
Marca otorgada por y = 5
Marca deducida por n = 2
Si el total de preguntas = 30; luego
y + n = 30 - - - - (1)
Puntuación total obtenida = 94; luego
5y - 2n = 94 - - - (2)
De 1),
y + n = 30
y = 30 - n
Sustituya y = 30 - n en equ (2)
5 (30 - n) - 2n = 94
150 - 5n - 2n = 94
150 - 7n = 94
-7n = 94-150
-7n = - 56
n = 56/7
n = 8
Sustituir n = 8 en (1)
y + n = 30
y + 8 = 30
y = 30 - 8
y = 22
y = número de respuestas correctas = 22
n = número de respuestas incorrectas = 8
Usando un sistema de ecuaciones, se encuentra que el participante obtuve 22 respuestas correctas.
En el sistema, x es el número de respuestas correctas, con y siendo el número de respuestas incorrectas.
Total de 30 preguntas, o sea:
[tex]x + y = 30 \rightarrow y = 30 - x[/tex]
5 puntos asignados por cada respuesta correcta, 2 restados por cada respuesta incorrecta. Puntaje de 94 puntos, o sea:
[tex]5x - 2y = 94[/tex]
Considerando [tex]y = 30 - x[/tex]
[tex]5x - 60 + 2x = 94[/tex]
[tex]7x = 154[/tex]
[tex]x = \frac{154}{7}[/tex]
[tex]x = 22[/tex]
El participante obtuve 22 respuestas correctas.
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