Answer:I think it’s 7x^3
Step-by-step explanation:
How to subtract LCD - 13/20 - 2/5
Answer: 13/20 - 2/5 = 1/4 ( Using LCD)
Step-by-step explanation:
Given: 13/20 - 2/5 = ? Use LCD
1) First we need find the least common multiple of the denominator (20 and 5) which is 20.
2) Since we know the least common multiple we know need to switch the two fractions up but since one of the denominator is already 20 ( 13/20) we now need to fix the other fraction (2/5).
3) We need to make it the same for both fractions so we want the same denominator as the first fraction (20) so we multiply 5 by 4 since 5 x 4 = 20 and we get 20, while also doing the same thing with the numerator. So we times 2 by 4 and we get 8.
4) Now our two fractions are now 13/20 and 8/20.
5) Our next step is to subtract the numerator, so its 13-8 which we get 5.
6) So now we have 5/20 and we want to simply to the smallest fraction so we find a number that is divisible and can make the smallest fraction which is 5.
5/5 and 20/5 and we get 1/4.
if a translation of (x, y) → (x + 6, y – 10) is applied to figure ABCD, what are the coordinates of D'? (–5, –2) (1, –12) (4, –15) (–9, –6)
Answer: The coordinates of D are (1,-12) .
Step-by-step explanation:
Given : Translation rule : (x, y) → (x + 6, y – 10) is applied to figure ABCD.
From the figure below, we have figure ABCD in which
The coordinates of D = (-5,-2)
According to the given translation rule :
D(-5,-2) → D'(-5 + 6, -2 – 10) (coordinates of image point D')
i.e. D(-5,-2) → D'(1, -12) [-5+6 = 1, -2-10 = -12]
Hence, the coordinates of D are (1,-12) .
Answer:
B. (1, –12)
Step-by-step explanation:
edge2021
PLEASE HELP I REALLY NEED HELP
Answer:
16
Step-by-step explanation:
perimeter of B = 21
divide by 3 to get each side: 21/3 = 7 = Y
perimeter of hexagon is 50. subtract 2Y: 50 - 14 = 36
divide 36 by 4 to find X = 9
add X + Y
A bowl contains pecans, cashews, and almonds in a ratio of 6 : 10 : 15, respectively. If some of the nuts of one of the three types are removed, which of the following could be the ratio of pecans to cashews to almonds remaining in the bowl?
i. 1 : 2 : 3
ii. 2 : 3 : 4
iii. 4 : 7 : 10
A. I only
B. II only
C. III only
D. I and III only
E. II and III only
Answer:
iii
Step-by-step explanation:
because of the amount taken from the cashews.and nuts and 1 of 3 were taken away
Find the center and radius of x^2 – 18x + y^2 -10y = -6. part two write x2 – 18x + y2 -10y = -6 in standard form
Answer:
see explanation
Step-by-step explanation:
I will begin with part two, first.
The equation of a circle in standard form is
(x - h)² + (y - k)² = r²
where (h, k) are the coordinates of the centre and r is the radius.
Given
x² - 18x + y² - 10y = - 6
Using the method of completing the square
add ( half the coefficient of the x/ y terms )² to both sides
x² + 2(- 9)x + 81 + y² + 2(- 5)y + 25 = - 6 + 81 + 25, that is
(x - 9)² + (y - 5)² = 100 ← in standard form
with centre = (9, 5 ) and r = [tex]\sqrt{100}[/tex] = 10
15 POINTS! three times X is 13 less than Y. the sum of X and two times y is 12 write two equations and graph to find the value of Y. A. y=-7 B. y=2 C. y=7 D. y=-2
An equation is a mathematical statement that is made up of two expressions connected by an equal sign.
The value of y is 7.
The graph of the two-equation is given below.
What is an equation?An equation is a mathematical statement that is made up of two expressions connected by an equal sign.
Example:
2x + 4 = 9 is an equation.
We have,
3x = y - 13 ____(1)
x + 2y = 12 _____(2)
From (1) we get,
x = (y - 13)/3 _____(3)
Putting (3) in (2) we get,
(y - 13)/3 + 2y = 12
y - 13 + 6y = 36
7y = 36 + 13
7y = 49
y = 7
The graph of the equation is given below.
Thus,
The value of y is 7.
The graph of the two-equation is given below.
Learn more about equations here:
https://brainly.com/question/17194269
#SPJ6
The level of water in a dam was decreasing by 20% each day. If the level of water was 1500cm,what was the level after two days?
Answer:
[tex] L_o= 1500 cm[/tex]
And we know that the level is decreasing 20% each day so then we can use the following model for the problem
[tex] L_f = L_o (1-0.2)^t[/tex]
Where t represent the number of days and L the level for this case we want to fnd the level after two days so then t =2 and replacing we got:
[tex] L_f = 1500cm(0.8)^2 = 960cm[/tex]
Step-by-step explanation:
For this case we know that the initial volume of water is:
[tex] L_o= 1500 cm[/tex]
And we know that the level is decreasing 20% each day so then we can use the following model for the problem
[tex] L_f = L_o (1-0.2)^t[/tex]
Where t represent the number of days and L the level for this case we want to fnd the level after two days so then t =2 and replacing we got:
[tex] L_f = 1500cm(0.8)^2 = 960cm[/tex]
Express the complex number in trigonometric form. 5 - 5i
●✴︎✴︎✴︎✴︎✴︎✴︎✴︎✴︎❀✴︎✴︎✴︎✴︎✴︎✴︎✴︎✴︎✴︎●
Hi my lil bunny!
❧⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯☙
Lets do this step by step.
This is the trigonometric form of a complex number where [tex]|z|[/tex] is the modulus and [tex]0[/tex] is the angle created on the complex plane.
[tex]z = a + bi = |z| (cos ( 0 ) + I sin (0))[/tex]
The modulus of a complex number is the distance from the origin on the complex plane.
[tex]|z| = \sqrt{a^2 + b^2}[/tex] where [tex]z = a + bi[/tex]
Substitute the actual values of a = -5 and b = -5.
[tex]|z| = \sqrt{(-5) ^2 + (-5) ^2}[/tex]
Now Find [tex]|z|[/tex] .
Raise - 5 to the power of 2.
[tex]|z| = \sqrt{25 + (-5) ^2}[/tex]
Raise - 5 to the power of 2.
[tex]|z| = \sqrt{25 + 25}[/tex]
Add 25 and 25.
[tex]|z| = \sqrt{50}[/tex]
Rewrite 50 as 5^2 . 2 .
[tex]|z| = 5\sqrt{2}[/tex]
Pull terms out from under the radical.
[tex]|z| = 5\sqrt{2}[/tex]
The angle of the point on the complex plane is the inverse tangent of the complex portion over the real portion.
[tex]0 = arctan (\frac{-5}{-5} )[/tex]
Since inverse tangent of [tex]\frac{-5}{-5}[/tex] produces an angle in the third quadrant, the value of the angle is [tex]\frac{5\pi }{4}[/tex] .
[tex]0 = \frac{5\pi }{4}[/tex]
Substitute the values of [tex]0 = \frac{5\pi }{4}[/tex] and [tex]|z| = 5\sqrt{2}[/tex] .
[tex]5\sqrt{2} ( cos( \frac{5\pi}{4}) + i sin (\frac{5\pi}{4}))[/tex]
❧⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯☙
●✴︎✴︎✴︎✴︎✴︎✴︎✴︎✴︎❀✴︎✴︎✴︎✴︎✴︎✴︎✴︎✴︎✴︎●
Hope this helped you.
Could you maybe give brainliest..?
❀*May*❀
The complex number (5 - 5i) in trigonometric form is
5√2 [cos(-π/4) + i sin(-π/4)]
What is an imaginary number?An imaginary number is denoted by i.
The value of i is √-1.
We have,
To express the complex number (5 - 5i) in trigonometric form,
We first need to find its modulus (r) and argument (θ).
The complex number (a - bi) in trigonometric form is
|r| [cosФ + i sinФ]
Now,
Modulus (r).
|r| = √(5² + (-5)²)
= √(50)
= 5√(2)
And,
Argument (θ).
θ = [tex]tan^{-1}[/tex](-5/5)
= -π/4
(since the complex number is in the fourth quadrant)
Therefore,
The complex number (5 - 5i) in trigonometric form is
5√2 [cos(-π/4) + i sin(-π/4)]
Learn more about imaginary numbers here:
https://brainly.com/question/6748860
#SPJ5
The circular base of a cone has a radius of 5 centimeters. The height of the cone is 12 centimeters, and the slant height is 13 centimeters. What is the approximate surface area of the cone? Use 3.14 for π and round to the nearest whole number. 267 cm2 283 cm2 456 cm2 487 cm2
Answer:
283 cm^2
Step-by-step explanation:
Solution:-
We have a cone with a circular base of radius r = 5 cm
The height of the cone is h = 12 cm
The slant height of the cone is L = 13 cm
We are to determine the surface area of the cone. The surface area of the cone is comprised of two parts:
Base Area : Circle
[tex]A_1 = \pi r^2\\\\A_1 = \pi 5^2\\\\A_1 = 25\pi[/tex]
Curved Surface: conical
[tex]A_2 = \pi * r*L\\\\A_2 = \pi * 5*13\\\\A_2 = 65\pi[/tex]
The total surface area of the cone can be written as ( A ):
[tex]A = A_1 + A_2\\\\A = (25 + 65 )*\pi \\\\A = 90*(3.14) \\\\A = 282.7433 cm^2[/tex]
Answer: The surface area of the cone to nearest whole number would be 283 cm^2
Consider the matrix A = \begin{pmatrix} 7 & 9 & -3 \\ 3 & -6 & 5 \\ 4 & 0 & 1 \end{pmatrix} ⎝ ⎛ 7 3 4 9 −6 0 −3 5 1 ⎠ ⎞ . What is the value of minor M_{11}M 11 ? 5 -6 0 -4
Answer:
The value of M₁₁ is -6.
Step-by-step explanation:
The minor, [tex]M_{ij}[/tex] is the determinant of a square matrix, say P, formed by removing the ith row and jth column from the original square matrix, P.
The matrix provided is as follows:
[tex]A=\left[\begin{array}{ccc}7&9&-3\\3&-6&5\\4&0&1\end{array}\right][/tex]
The matrix M₁₁ is:
Remove the 1st row and 1st column to form M₁₁,
[tex]M_{11}=\left|\begin{array}{cc}-6&5\\4&0\end{array}\right|[/tex]
Compute the value of M₁₁ as follows:
[tex]M_{11}=\left|\begin{array}{cc}-6&5\\4&0\end{array}\right|[/tex]
[tex]=(-6\times 1)-(5\times 0)\\\\=-6-0\\=-6[/tex]
Thus, the value of M₁₁ is -6.
A swimming pool can be emptied in 6 hours using a 10-horsepower pump along with a 6-horsepower pump. The 6-horsepower pump requires 5 hours more than the 10-horsepower pump to empty the pool when working by itself. How long will it take to empty the pool using just the 10-horsepower pump?
Answer: 10 hours
Step-by-step explanation:
The 10hp pump takes x hours to empty the pool which means it gets [tex]\dfrac{1}{x}[/tex] of the job done in one hour.
The 6hp pump takes x+5 hours to empty the pool which means it gets [tex]\dfrac{1}{x+5}[/tex] of the job done in one hour.
Together, they can get [tex]\dfrac{1}{x}+\dfrac{1}{x+5}[/tex] of the job done in one hour.
It is given that together they get the job done in 6 hours which means they get [tex]\dfrac{1}{6}[/tex] of the job done in one hour.
10 hp pump + 6 hp pump = Together
[tex]\dfrac{1}{x}\quad +\quad \dfrac{1}{x+5}\quad =\quad \dfrac{1}{6}[/tex]
Multiply by 6x(x+5) to eliminate the denominator:
[tex]\dfrac{1}{x}(6x)(x+5) +\dfrac{1}{x+5}(6x)(x+5) = \dfrac{1}{6}(6x)(x+5)[/tex]
Simplify and solve for x:
6(x + 5) + 6x = x(x + 5)
6x + 30 + 6x = x² + 5x
12x + 30 = x² + 5x
0 = x² - 7x - 30
0 = (x - 10)(x + 3)
0 = x - 10 0 = x + 3
10 = x -3 = x
Since the number of hours cannot be negative, disregard x = -3.
So, the only valid answer is x = 10.
There are 238 juniors at a high school The ratio of boys to girls in the junior class is 3:4. How many juniors are girls?
Answer:
59.5
Step-by-step explanation:
I know there cannot be half a human running around the school, and I don't exactly remember if you round up or down, but there are a total of 238 juniors in the school. you divide 238 by 4. the girls represent one fourth of the juniors, and the boys represent three fourths. thank you, please mark brainliest!
An electronics store is having a back-to-school sale. Blake is interested in purchasing a new computer, and the one he’s been wanting to buy currently has a manufacturer’s rebate of $100. The store is also offering a 10% discount with a school ID, which Blake carries regularly in his wallet. Part A Suppose f(x) = x − 100 and g(x) = 0.9x. Find (f ∘ g)(x).
Answer:
(f ∘ g)(x) = 0.9x - 100
Step-by-step explanation:
Here in this question, we are interested in calculating (f ∘ g)(x)
From the question, we are given;
f(x) = x -100
g(x) = 0.9x
So (f ∘ g)(x) simply means we shall be representing the x in f(x) with the totality of the value of g(x)
Mathematically, what we are saying is that;
Find (f ∘ g)(x) = 0.9x - 100
Two cards are selected at random from a standard deck of cards. What is the probability that you select a king or a queen? (If your answer will reduce, you should reduce it.) Also show you're work
Answer:
2/13
Step-by-step explanation:
In a standard deck of cards, there are 52 cards total, 4 kings, and 4 queens.
Probability is calculated by (number of favorable outcomes)/(number of possible outcomes), so our probability would be 8/52, which can be simplified to 2/13.
Hope this helps!
A weight is attached to a spring, which moves up and down as a function of time. p(t) gives the position of the weight at time (t). Position is in centimeters, and time is in seconds. Complete the following sentences based on the graph of the function. · The graph is a linear, nonlinear, or constant function. · The initial position of the weight is _ centimeter(s). · The weight first reaches equilibrium when t = _ second(s). Note: We say that the weight is at equilibrium whenever p(t)=0 cm and we say that the initial position of the block is its position when t=0s PLZ help me look at the picture for the graph plz answer ASAP thank you
Answer:
This graph is nonlinear
The initial displacement of the weight is 40cm
The weight first returns to equilibrium when t=1/2
Step-by-step explanation:
thats the answer i only had time to give not to explain
Answer:
the answer is in the photo ^^
Step-by-step explanation:
the correct thing is there for confirmation ;)
25 percent of 510,000
Answer:
127 500
Step-by-step explanation:
Let x be the missing value.
● 510 000 => 100
● x => 25
x = (25*51000)÷100 = 127 500
Answer:
hope it helps
Step-by-step explanation:
25 percent of 510,000 = 127,500
Solve this application problem using a system of equations: Dan and June mix two kinds of feed for pedigreed dogs. They wish to make 70 pounds of feed worth $0.30 per pound by mixing Feed A worth $0.26 per pound with Feed B worth $0.40 per pound. How many pounds of the cheaper kind should they use in the mix
Answer:
50 pounds
Step-by-step explanation:
Dan and june mix two kind of feed for pedigreed dogs
Feed A worth is $0.26 per pound
Feed B worth is $0.40 per pound
Let x represent the cheaper amount of feed and y the costlier type of feed
x+y= 70..........equation 1
0.26x + 0.40y= 0.30×70
0.26x + 0.40y= 21.........equation 2
From equation 1
x + y= 70
x= 70-y
Substitutes 70-y for x in equation 2
0.26(70-y) + 0.40y= 21
18.2-0.26y+0.40y= 21
18.2+0.14y= 21
0.14y= 21-18.2
0.14y= 2.8
Divide both sides by the coefficient of y which is 0.14
0.14y/0.14= 2.8/0.14
y= 20
Substitute 20 for y in equation 1
x + y= 70
x + 20= 70
x= 70-20
x = 50
Hence Dan and june should use 50 pounds of the cheaper kind in the mix
Please answer this question now
Answer:
MN = 14 ft
Step-by-step explanation:
NP tangent => ∡PNM = 90°
Pythagoras
MN = √MP² - NP²
= √50² - 48²
= √(50 - 48)(50 + 48)
= √2×98
= √196
= √14²
= 14 ft
A certain quantity grows exponentially over time. The initial quantity at t = 0 is 2,000. The quantity
grows by a factor of 20%. What is the quantity at t = 8?
A 0.00512
B. 8,599.63392
C. 10,319.56070
D. 12,383.47284
Answer:
B
Step-by-step explanation:
using the equation y=2000*1.2^8 we can get the exact value of y which aligns with b
jasper owns a small retail store as a sole proprietor. the business records show that the cost of the stores inventory items has been steadily increasing. the cost of the end of the year inventory is 200,000 and the cost of the beginning of the year inventory was 250,000. jasper uses the fifo method of inventory valuation. Which of the following statements are true?
a. jasper purchases more inventory during the year than sold during the same one year period.
b. jasper would have a higher net income
if he used the lifo method of inventory valuation instead of the fifo method
c. jasper has apparently decreased the volume of items in his ending inventory as compared to the number of items in his beginning inventory
d. since the cost of the stores inventory items is increasing, jasper will have a greater cost of goods sold figure under the fifo than the lifo.
e. none of the above
Answer:
c. jasper has apparently decreased the volume of items in his ending inventory as compared to the number of items in his beginning inventory
Step-by-step explanation:
First In First Out FIFO is a type of inventory system in accounting, it literally implies that the oldest purchase goes out first when you made a sale. The oldest purchase are charged based on cost of good sold. If price are rising, :
FIFO will yield a lower cost of good sold
FIFO will yield a higher net income
FIFO will yield higher tax liability
FIFO will yield a higher inventory
From the information given:
the business records show that the cost of the stores inventory items has been steadily increasing. the cost of the end of the year inventory is 200,000 and the cost of the beginning of the year inventory was 250,000.
What the statement implies is that:
jasper has apparently decreased the volume of items in his ending inventory as compared to the number of items in his beginning inventory
An electronics company designed a cardboard box for its new line of air purifiers. The figure shows the dimensions of the box.
The amount of cardboard required to make one box is___square inches.
a)130
b)111
c)109
d)84
Answer:
130
Step-by-step explanation:
just did test on plato/edmentum..it was correct
84 (the answer above) is incorrect
Answer:
Hi sorry for late respond but the answer in 130!!
Step-by-step explanation:
A box contains 5 yellow toys and 4 red toys. Two toys are selected with replacement.
- Draw a tree diagram showing all outcomes and probabilities
-Find the probability that:
A. Two toys of the same colour will be picked
B. Toys of different colours will appear
C. A red toy will be picked first
D. At least one red toy will be picked
-if there was no replacement, find the probability that:
A. Two toys of the same colours will be picked
B. Toys of different colours will appear
C. A red toy will be picked first
D. At least one red toy will be picked
Answer:
Kindly check explanation
Step-by-step explanation:
Given the following :
Yellow (Y) toys = 5
Red (R) toys = 4
Total toys = yellow + red = (5 +4) = 9
WITH REPLACEMENT :
Probability that two toys of same color will be picked.
From the tree diagram.
Two toys of the same color
a.)P(Y, Y) + P(R, R) = (25/81) + (16 / 81) = 41/81
b) toys of different color :
P(Y, R) + P(R, Y) = (20/81) + (20/81) = 40/81
c.) A red toy will be picked first :
P(R, Y) = 20/81
d.) Atleast one red toy will be picked
P(Y, R) + P(R, Y) + P(R, R)
20 /81 + 20/81 + 16/81 = 56/81
2) WITHOUT REPLACEMENT :
a.)P(Y, Y)+P(R, R) = (20/72) + (12/72) = 32/72 = 4/9
b) P(Y, R)+P(R, Y) = (20/72)+(20/72)= 40/72 = 5/9
c) p(R, Y) = 12/72 = 1/6
d) P(Y, R) + P(R, Y) + P(R, R) = 20/72 + 20/72 + 12/72 = 52/72 = 13/ 18
Lucy is a dress maker. She sew 4/7 of a dress in 3/4 hour. lucy sews at a constant rate At this rate, how many dresses does lucy sew in one hour
Answer:
(5 1/3)/7
Step-by-step explanation:
Divide 4 by 3, then times it by four and put it over the 7
Which lists all of the y-intercepts of the graphed function? (0, –3) (–1, 0) and (3, 0) (0, –1) and (0, 3) (–1, 0), (3, 0), and (0, –3)
Answer:
The correct option is;
(0, -3), (-1, 0) and (3, 0)
Step-by-step explanation:
From the given graph of the function we have the following observations;
There are two x-intercepts which are;
1) To the left of the vertical y-axis having coordinates (-1, 0)
2) To the the right of the y-axis having coordinates (3, 0)
There is only one y-intercept having coordinates, (0, -3)
Therefore, all the intercepts of the function are, (0, -3), (-1, 0) and (3, 0).
Answer:
(0, -3), (-1, 0) and (3, 0)
Step-by-step explanation:
Find the slope of the line that passes through (6, 7) and (2, 16). Simplify your answer and write it as a proper fraction, improper fraction, or integer.
Answer:
m = -9/4
Step-by-step explanation:
Slope Formula: [tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
Simply plug in the coordinates into the slope formula:
m = (16 - 7)/(2 - 6)
m = 9/-4
m = -9/4
dilate the given triangle with a magnitude of 3 [3 6 3 -3 3 3]
Answer:
The coordinates of the triangle, (3, 6), (3, -3), and (3, 3), dilated by a magnitude of 3 is;
(9, 18), (9, -9), and (9, 9)
Step-by-step explanation:
The vertices of the given triangle are;
(3, 6), (3, -3), and (3, 3)
A dilation with a magnitude of 3 can be found as follows;
For each value of the x, and y-coordinates of the vertices, we multiply by the magnitude of dilation
As an example, the coordinate of the points on a line, (x₁, y₁) and (x₂, y₂), dilated by a scale factor of m, will become, (m·x₁, m·y₁) and (m·x₂, m·y₂)
Therefore, we have foe a magnitude of 3;
(3, 6), (3, -3), and (3, 3) becomes, (3×3, 3×6), (3×3, 3×(-3)), and (3×3, 3×3)
(9, 18), (9, -9), and (9, 9).
Answer:
(9, 18), (9, -9), and (9, 9)
Step-by-step explanation:
A right triangle has a height of 18 inches and a base of 12 inches find the area of the triangle in square inches find the area of the triangle in square inches
Answer: 108 square inches
Step-by-step explanation:
The formula for any square is base*height/2. The formual to find the area of a square is base*height. If you draw out a square and cut it in half diagonaly, you get a right triangle. That is why you divide it by 2. (sorry if the explanation was clunky/ hard to understand)
1. You would multiply 18*12 which equals 216.
2. Divide 216 by 2. 216/2= 108.
The answer is 108. Hope this helped you:)
The area of the triangle is 108 square inches.
What is the area of the triangle?The area of the triangle is defined as the product of half the base and the height of the triangle.
The area of the triangle = 1/2 x b x h
If we draw out a square and cut it in half diagonaly, you get a right triangle. That is why we need to divide it by 2.
The area of the triangle = 1/2 x b x h
The area of the triangle = 1/2 x 12 x 18
= 216/2= 108.
The area of the triangle is 108 square inches.
Learn more about the area;
https://brainly.com/question/1658516
#SPJ2
Suppose we have three urns, namely, A B and C. A has 3 black balls and 7 white balls. B has 7 black balls and 13 white balls. C has 12 black balls and 8 white balls. We first choose one urn from A, B and C. Then we randomly pick up two balls from that urn without replacement. Let Ai, i 1,2,3 denote the event that the urn we choose is A, B and C respectively. Suppose P(A1): P(A2): P(A3) =1:2:2. Compute :
(a) The probability that the first ball is black.
(b) The probability that the first ball is black given that the second ball is white.
Answer:
a. 11/25
b. 11/25
Step-by-step explanation:
We proceed as follows;
From the question, we have the following information;
Three urns A, B and C contains ( 3 black balls 7 white balls), (7 black balls and 13 white balls) and (12 black balls and 8 white balls) respectively.
Now,
Since events of choosing urn A, B and C are denoted by Ai , i=1, 2, 3
Then , P(A1 + P(A2) +P(A3) =1 ....(1)
And P(A1):P(A2):P(A3) = 1: 2: 2 (given) ....(2)
Let P(A1) = x, then using equation (2)
P(A2) = 2x and P(A3) = 2x
(from the ratio given in the question)
Substituting these values in equation (1), we get
x+ 2x + 2x =1
Or 5x =1
Or x =1/5
So, P(A1) =x =1/5 , ....(3)
P(A2) = 2x= 2/5 and ....(4)
P(A3) = 2x= 2/5 ...(5)
Also urns A, B and C has total balls = 10, 20 , 20 respectively.
Now, if we choose one urn and then pick up 2 balls randomly then;
(a) Probability that the first ball is black
=P(A1)×P(Back ball from urn A) +P(A2)×P(Black ball from urn B) + P(A3)×P(Black ball from urn C)
= (1/5)×(3/10) + (2/5)×(7/20) + (2/5)×(12/20)
= (3/50) + (7/50) + (12/50)
=22/50
=11/25
(b) The Probability that the first ball is black given that the second ball is white is same as the probability that first ball is black (11/25). This is because the event of picking of first ball is independent of the event of picking of second ball.
Although the event picking of the second ball is dependent on the event of picking the first ball.
Hence, probability that the first ball is black given that the second ball is white is 11/25
PLZ HELP!!!!!!
(06.05 MC)
A group of students were surveyed to find out if they like watching television or reading during their free time. The results of the survey are shown below
90 students like watching television
20 students like watching television but do not like reading
80 students like reading
40 students do not like watching television
Make a two-way table to represent the data and use the table to answer the following questions.
Part A: What percentage of the total students surveyed like both watching television and reading? Show your work. (5 points)
Part B: What is the probability that a student who does not like watching television also does not like reading? Explain your answer. (5 points)
Answer:
A: 39.1304348% OR 39%
B: 33.3%
Step-by-step explanation:
Part A:
find the total amount of children: 90+20+80+40=230
90-20=50
i got this from taking away the amount that like watching tv and not reading so from this you know 50 of those 90 that like watching tv also like tv and reading.
80-40=40
(same explanation as 90-20=50)
then do 50 +40 which equals 90
now you need to turn it into a percentage.
90/230=
9/23
=39.1304348%
if you need round it, do so!
Part b:
40+20=60
20/60= 2/6
=1/3
=33.3%
Find the value of this expression if x=3 x^2 + 3/x-1
Answer: 9
Step-by-step explanation:
[tex]3^2 + \frac{3}{3}-1\\\\=9+1-1\\\\=9[/tex]