68% of the data values will be within one standard deviation (0.6) of the mean.
95% of the data values will be within 2 standard deviations (1.2) of the mean.
99.7% of the data values will be within 3 standard deviations (1.8) of the mean.
duncan swam 3/4 of a mile each day on monday wednesday thursday and friday how many miles did he swim in all
What value of x satisfies the system of equations below? x + y = 2 7x - y = 2
Answer:
0.5
Step-by-step explanation:
We want to get an equation with only one variable for it to be able to be solved.
To do this, we will solve the first equation for y.
[tex]x+y=2\\y=2-x[/tex]
Now, we can plug this value of y into the second equation
[tex]7x-y=2\\7x-(2-x)=2\\[/tex]
Finally, we have just one variable, and we can solve for x.
[tex]7x-(2-x)=2\\7x-2+x=2\\8x=4\\x=0.5[/tex]
Marta simplified this expression.
4 logs x+logs 2x log, 3x
In which step did she incorrectly apply a property of logarithms?
Answer:
step 1
Step-by-step explanation:
You want to know which step in Marta's simplification of 4·log₅(x) +log₅(2x) -log₅(3x) contains an error in application of properties of logarithms.
Properties of logslog(a^b) = b·log(a)
log(ab) = log(a) +log(b)
log(a/b) = log(a) -log(b)
Simplification[tex]4\log_5(x)+\log_5(2x)-\log_5(3x)\\\\=\log_5(x^4)+\log_5(2x)-\log_5(3x)\qquad\text{Step 1. Mistake: $4x$ instead of $x^4$}\\\\\log_5(x^4\cdot2x)-\log_5(3x)=\log_5\left(\dfrac{2x^5}{3x}\right)\\\\=\boxed{\log_5\left(\dfrac{2x^4}{3}\right)}[/tex]
5. Apply logarithm to evaluate T given 644 204 = 400 000(1+10%), by first simplifying the equation.
Answer:
the value of T that satisfies the equation 644 204 = 400 000(1+10%) is approximately 6.45.
Step-by-step explanation:
We can simplify the equation 644 204 = 400 000(1+10%) by first simplifying the percentage term on the right-hand side:
10% of 400 000 is equal to 0.1 × 400 000 = 40 000.
So the equation becomes:
644 204 = 400 000(1 + 0.1 × 1)
Now, we can use logarithms to solve for T:
T = log(base 1.1)(644204/400000)
Using a calculator, we can evaluate the right-hand side to be approximately 0.2, so:
T = log(base 1.1)(1.61051)
Using the change of base formula, we can rewrite this as:
T = ln(1.61051) / ln(1.1)
Evaluating the natural logarithms using a calculator, we get:
T ≈ 6.45
How much would you need to deposit every month in an
account paying 6% per year to accumulate $1,000,000 by age 65
starting when you are 20 years old?
Goods in transit worth K95 480 were insured against damage at k 682 in every K27 200 worth of goods. Find the premium for insuring the goods.
Answer: To find the premium for insuring the goods, we need to determine the total amount of insurance that is needed and then calculate the cost of the insurance based on the given rate.
The total amount of insurance needed is equal to the value of the goods in transit, which is K95 480.
To determine the cost of the insurance, we can use the given rate of K682 for every K27 200 worth of goods. We can set up a proportion:
(K682 / K27 200) = (premium / K95 480)
To solve for the premium, we can cross-multiply and simplify:
K682 * K95 480 = K27 200 * premium
premium = (K682 * K95 480) / K27 200
premium = K1 897.12
Therefore, the premium for insuring the goods is K1 897.12.
Step-by-step explanation:
use the number lineto find the difference 3 1/2 - 5
a. -8 1/2
b. -1 1/2
c. 2 1/2
d. -2 1/2
Answer:
Step-by-step explanation:
A "Pick 3" lottery game involves drawing
3 numbered balls from separate bins
each containing balls labeled from 0 to 9.
So there are 1,000 possible selections in
total: 000, 001, 002, . . . , 998, 999.
Players can choose to play a "straight"
bet, where the player wins if they choose
all 3 digits in the correct order. Since
there are 1,000 possible selections, the
probability a player wins a straight bet is
1/1,000. The lottery pays $400 on a
successful $1 straight bet, so a player's
net gain if they win this bet is $399.
Let X represent a player's net gain on a
$1 straight bet.
Calculate the expected net gain E(X).
According to the question the expected net gain for a player on a $1 straight bet is -$0.60.
how to calculate expected value in probability?Simply multiply each value of the discrete random variable X by its probability and add the products to get the expected value, E(X), or mean. The formula is as follows: E (X) = ∑ x P (x)
The possible outcomes for X are winning with a probability of 1/1000 and net gain of $399, and losing with a probability of 999/1000 and net gain of -$1. Therefore, we can calculate the expected value of X as follows:
E(X) = (1/1000)($399) + (999/1000)(-$1)
E(X) = $0.399 - $0.999
E(X) = -$0.60
Therefore, the expected net gain for a player on a $1 straight bet is -$0.60. This means that, on average, a player will lose $0.60 for each $1 bet they place on this game.
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Answer:
-0.60
Step-by-step explanation:
Khan Academy
Every day, people face problems at home, work, school, or in their community that they must solve. Think about your life from the past 2 weeks, when something did not work out the way you intended, such as your car breaking down, you running out of milk, or facing a scheduling conflict. A lot of them need you to use math to help solve the problem.
Share at least 1 problem that you encountered recently, and answer the following questions in your main post:
What was the problem, and why it was difficult for you?
How did you use math in trying to solve the problem, and what was the outcome?
How would you approach in the problem differently next time?
Problem: Imagine a person, John, facing a scheduling conflict due to overlapping appointments.
John had a dentist appointment at 2 PM, which he expected to last an hour, but he also had a meeting scheduled with his colleague at 3 PM.
Why it was difficult: The scheduling conflict made it difficult for John to manage both appointments without disappointing either party.
Math used to solve the problem: John decided to calculate the time it would take him to travel from the dentist's office to the meeting location, considering the appointment duration and travel time.
Dentist appointment: 2 PM - 3 PM
Travel time (calculated using distance and speed): 30 minutes
Meeting time: 3 PM
John realized he would be 30 minutes late for the meeting if he attended the dentist appointment.
Outcome: John decided to reschedule his dentist appointment to an earlier time or another day to avoid the conflict.
Approaching the problem differently next time:
In the future, John could consider using a calendar app to keep track of his appointments and avoid scheduling conflicts.
Additionally, he could factor in the duration of events and travel times when scheduling appointments to ensure he has enough time between engagements.
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need help writing a equation for this in the picture
(100 points)
The equation of circle with endpoints at (-3, 0) and (3, 0) is x² + y² = 9
What is the equation of circle?The end points (-3, 0) and (3, 0) represent the endpoints of a diameter of the circle. The center of the circle is the midpoint of this diameter. We can find the midpoint of the diameter by averaging the x-coordinates and the y-coordinates of the endpoints:
Midpoint = ((-3 + 3)/2, (0 + 0)/2) = (0, 0)
So the center of the circle is at the point (0, 0). The radius of the circle is half the length of the diameter, which is:
Radius = 1/2 * distance between (-3, 0) and (3, 0)
= 1/2 * 6
= 3
Therefore, the equation of the circle with endpoints at (-3, 0) and (3, 0) is:
(x - 0)² + (y - 0)² = 3²
Simplifying:
x² + y² = 9
So the equation of the circle is x² + y² = 9.
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Solve each absolute value inequality and show its solution set.
|5t-1|>21
The solution set of the given inequality is (-4, 4.4)
Here are the steps to follow when solving absolute value inequalities:
Isolate the absolute value expression on the left side of the inequality.
If the number on the other side of the inequality sign is negative, your equation either has no solution or all real numbers as solutions.
Clear the absolute-value bars by splitting the equation into its two cases, one for the Positive case and the other for the Negative case.
|5t-1| > 21
case 1)
for positive
5t-1 > 21
5t > 22
t > 4.4
for negative
-(5t-1) > 21
-5t+1 > 21
-5t > 20
t< -4
hence the solution set of the given inequality is (-4, 4.4)
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Find the area of this shape
200.55ft³
12×12= 144 (area of the square)
pi×radius² = area of a circle but since it is only half a circle, divide the answer by two and add the area of the semi circle and square for the total area
Are the two triangles similar?
Answer:
Yes the Triangle are similar by A.A.A Axiom
Answer:
yes, they two triangles are similar
Step-by-step explanation:
.........
A square with a side length of 81 meters was created from a square with a side length of 4.5 meters using a scale factor. What is the scale factor?
54:1
18:1
128:1
364:1
The scale factor of the dilation of the square is (b) 18 : 1
Calculating the scale factorTo find the scale factor, we need to determine how many times the length of the original square was multiplied to obtain the length of the new square.
The length of the original square is 4.5 meters, and the length of the new square is 81 meters.
Therefore, we need to divide the length of the new square by the length of the original square to find the scale factor:
81 meters ÷ 4.5 meters = 18
So the scale factor is 18:1.
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Which might be a disadvantage to using equations for solving problems?
OA. It can be difficult to remember what an equation means without a
diagram, graph, or table.
B. They can be solved using algebra.
C. They cannot be solved if they have only one varible
Answer:
A disadvantage to using equations for solving problems might be that it can be difficult to remember what an equation means without a diagram, graph, or table (Option A).
Step-by-step explanation:
Work out 320.041 – 47.96
Answer:
272.14100
Subtract 47.96 from 320.041
320.041 - 47.96 = 272.14100
Answer:
272.081
Step-by-step explanation:
You're welcome
See the problem in the image.
Please help solve this
The vertices οf the given inequalities are (2,0);(-6,0); (0,-1);(0,-3);(-2,-2)
What is inequality?In mathematics, inequality is a statement οf an οrder relatiοnship that is a relatiοnship between twο values that are nοt equal,—greater than, greater than οr equal tο, less than, οr less than οr equal tο—between twο numbers οr algebraic expressiοns. Such as 7<9 οr 5>3 etc.
The given system οf inequalities are:
2y-x≥ -2
2y+x≥ -6
y≤0
x≤0
Tο find the vertices we must cοnvert the inequality intο an equatiοn.
Sο the equatiοns are:
2y - x= -2-----------------(1)
2y + x= -6----------------(2)
y=0-----------------(3)
x=0 -----------------(4)
Putting the value οf equatiοn (3) in equatiοn (1) and (2) we get,
x=2 and x= -6
Again putting the value οf equatiοn (4) in equatiοn (1) and (2) we get,
y=-1 and y=-3
Sο frοm these the vertices can be written as (2,0);(-6,0) and (0,-1);(0,-3)
Nοw , subtracting equatiοn (2) frοm equatiοn (1) we get,
( 2y - x )-(2y+x)= -2-(-6)
⇒ -2x= 4
⇒x= -2
Putting this value x=-2 in equatiοn (1) we get,
2y-(-2)=-2
⇒2y+2=-2
⇒2y=-4
⇒ y= -2
Hence the vertices οf the given inequalities are (2,0);(-6,0); (0,-1);(0,-3);(-2,-2)
A graph fοr the inequalities is attached belοw.
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RSM a pharmisest has a 18 percent alcohol sulution and a 40 percent alcohol sulution how much of each must he use to make 10 leaters of 20 persent alcohol sulution
Answer:
To make 10 liters of 20% alcohol solution, RSM would need to use a combination of the 18% and 40% alcohol solutions. Let's call the amount of 18% solution used "x" and the amount of 40% solution used "y".
To set up the equation, we'll use the fact that the amount of pure alcohol in the final solution must be equal to 20% of the total volume.
So:
0.18x + 0.40y = 0.20(10)
Simplifying:
0.18x + 0.40y = 2
We have one equation with two unknowns, which means we need another equation. Fortunately, we know that RSM is making a total of 10 liters of solution. So:
x + y = 10
We now have two equations with two unknowns, which we can solve simultaneously. One way to do this is to solve one equation for one variable, then substitute that expression into the other equation, like so:
x = 10 - y (from the second equation)
0.18(10-y) + 0.40y = 2 (substituting into the first equation)
1.8 - 0.18y + 0.40y = 2
0.22y = 0.2
y = 0.91
So RSM would need to use approximately 0.91 liters (or 910 milliliters) of the 40% solution, and the rest (9.09 liters or 9090 milliliters) of the 18% solution, to make 10 liters of 20% alcohol solution.
Find the value of x.
Answer:
x = 8°
Step-by-step explanation:
∠GJL = ∠WJZ = 90° - 18° = 72° (cross angles)
(9x)° = 72° / : 9
x = 8°
Answer:
x = 8
Step-by-step explanation:
Find the measure of angle WJZ.
Since angles on a straight line sum to 180°:
⇒ m∠GJH + m∠HJW + m∠WJZ = 180°
⇒ 90° + 18° + m∠WJZ = 180°
⇒ 108° + m∠WJZ = 180°
⇒ 108° + m∠WJZ - 108° = 180° - 108°
⇒ m∠WJZ = 72°
According to the Vertical Angles Theorem, when two straight lines intersect, the opposite vertical angles are congruent.
Since line GJZ and line LJW intersect, then ∠GJL and ∠WJZ are vertical angles and therefore congruent:
⇒ m∠GJL = m∠WJZ
⇒ (9x)° = 72°
⇒ 9x = 72
⇒ 9x ÷ 9 = 72 ÷ 9
⇒ x = 8
Therefore, the value of x is 8.
Question
Use a net of the square pyramid, if necessary, to find the surface area of the pyramid.
3and3
The steps to find surface area of pyramid using a net of square pyramid is given below.
find the surface area of a square pyramid using a net:
Start with a net of the square pyramid. A net is a 2-dimensional representation of a 3-dimensional object that can be folded into the shape of the object. Identify the different faces of the pyramid. A square pyramid has one square base and four triangular faces.Calculate the area of the base. The base of a square pyramid is a square, so its area is equal to the length of one side squared.Calculate the area of each triangular face. To find the area of a triangle, you can use the formula A = (1/2)bh, where b is the base of the triangle and h is its height. In a square pyramid, each triangular face has a base that is equal to one side of the square base and a height that is equal to the slant height of the pyramid.Add up the areas of all the faces to find the total surface area of the pyramid.The slant height of a square pyramid can be found using the Pythagorean theorem, where a and b are the length of one side of the base and h is the height of the pyramid:
slant height = √(a² + (1/2×h)²)
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what is the similar between percent of markup and percent of discount
The two are similar because both use a percentage as a decimal to get a new price.
PLS HELP ASP!!!!
A race car drove around a circular track that was 0.5 mile. If 1 mile = 5,280 feet, what is the radius of the track, in feet? Use π = 3.14 and round to the nearest hundredth.
124.20 feet
248.41 feet
420.38 feet
840.76 feet
the radius of the track is approximately 420.38 feet.
Why is it?
The circumference of the circular track is 0.5 miles or 0.5 × 5280 = 2640 feet.
The formula for the circumference of a circle is C = 2πr, where C is the circumference and r is the radius.
Therefore, 2640 = 2 × 3.14 × r
Simplifying the equation: 2640 = 6.28r
Dividing both sides by 6.28: r ≈ 420.38 feet
Therefore, the radius of the track is approximately 420.38 feet.
Circumference is the distance around the edge of a circle or any other curved, circular object. It is also the perimeter of the circle. It is calculated by multiplying the diameter of the circle by pi (π), which is a mathematical constant that is approximately equal to 3.14.
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Can I please get help with this?
[tex]~~~~~~ \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\dotfill &\$4000\\ r=rate\to 2.7\%\to \frac{2.7}{100}\dotfill &0.027\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{\underline{semi-annually}, thus twice} \end{array}\dotfill &2\\ t=years\dotfill &10 \end{cases}[/tex]
[tex]A = 4000\left(1+\frac{0.027}{2}\right)^{2\cdot 10}\implies A=4000(1.0135)^{20} \implies \boxed{A \approx 5230.40} \\\\[-0.35em] ~\dotfill[/tex]
[tex]~~~~~~ \textit{Annual Percent Yield Formula} \\\\ ~~~~~~~~~~~~ \left(1+\frac{r}{n}\right)^{n}-1 ~\hfill \begin{cases} r=rate\to 2.7\%\to \frac{2.7}{100}\dotfill &0.027\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{\underline{semi-annually}, thus twice} \end{array}\dotfill &2 \end{cases} \\\\\\ \left(1+\frac{0.027}{2}\right)^{2}-1\implies 1.0135^2-1\approx 0.02718 ~~ \approx ~~ \stackrel{ 0.02718\times 100 }{\boxed{2.718~\%}}[/tex]
A tree casts a shadow 21 m long. The angle of elevation of the sun is 51°. What is the height of the tree? Record your answer in the table below.
Answer:
17.2 meters
Step-by-step explanation:
We can use the tangent function to solve this problem. Let's denote the height of the tree as h. Then we have the following:
tan(51°) = h / distance from the tree to the end of the shadow
We can find the distance from the tree to the end of the shadow by using the length of the shadow and the angle of elevation of the sun. Since the shadow is 21 meters long, and the angle of elevation of the sun is 51°, we can use the following trigonometric relationship:
tan(51°) = h / distance from the tree to the end of the shadow
tan(51°) = h / x (where x is the distance from the tree to the end of the shadow)
To find x, we can use the following trigonometric relationship:
tan(39°) = h / x (where 39° is the complementary angle to 51°)
We can solve for x by rearranging this equation as follows:
x = h / tan(39°)
Substituting this expression for x into the first equation, we have:
tan(51°) = h / (h / tan(39°))
Simplifying this equation, we get:
h = (21 m) * tan(51°) / tan(39°)
Using a calculator, we find h to be the following:
h = 17.2 meters
Therefore, the height of the tree is approximately 17.2 meters.
recently, alicia went on a trip. on the first part of the trip, she drove 260 miles to visit her grandparents. this distance is 4/5 of the total she traveled. what equation can you use to find d, the total length of her trip in miles
The equation that can be used to find d, based on the options for the parts of the equation is; (4/5) × d = 260
What is an equation?An equation is a statement of equivalence between expressions.
The specified equation is; _ _ d = _
The distance of the first part of Alicia's trip = 260 miles
The part of the total distance traveled of the trip represented by the first part of Alicia's trip = 4/5
The total length of Alicia's trip = d
An equation that can be used to find the total length of Alicia's trip therefore is; (4/5) × d = 260
The total distance traveled, d, can be obtained from the above equation when d is made the subject of the equation as follows;
(4/5) × d = 260
d = 260/(4/5) = 260 × 5/4 = 325
The total distance Alicia traveled, d = 325 miles
The correct equation is therefore; (4/5) × d = 260
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A giant tortoise can travel 0.14 miles in 1 hour. At this rate, how long would it take the tortoise to travel 3 miles
It would take the giant tortoise approximately 21.43 hours to travel 3 miles at a rate of 0.14 miles per hour.
What is distance?
Distance is the measure of how far apart two objects or locations are from each other. It is usually measured in units such as meters, kilometers, miles, or feet. Distance is a scalar quantity, meaning it has only magnitude and no direction.
We can use the formula:
time = distance ÷ speed
where "distance" is the total distance to be traveled and "speed" is the rate of travel.
In this case, the distance is 3 miles and the speed is 0.14 miles per hour. So we can substitute these values into the formula and solve for "time":
time = 3 miles ÷ 0.14 miles per hour
time ≈ 21.43 hours
Therefore, it would take the giant tortoise approximately 21.43 hours to travel 3 miles at a rate of 0.14 miles per hour.
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Select the correct answer from the drop-down menu. The design for a two-tank system is shown. The inner tank must be surrounded by oxygen with a density of 0.0827 pounds per cubic foot. Diagram shows a small rectangular prism placed inside a large rectangular prism. Small prism has a length of 5 feet, a width of 4 feet, and a height of 3 feet. Large prism has a length of 20 feet, a width of 8 feet, and a height of 6 feet. What amount of oxygen is needed in the outer tank? To meet the density required, approximately pounds of oxygen is required.
Answer:
74.43 pounds
Step-by-step explanation:
To find the amount of oxygen needed in the outer tank, we need to first find the volume of the space between the two tanks. This space is a rectangular prism with length 20 feet, width 8 feet, and height 6 feet, but with a rectangular prism removed from the center. The removed prism has length 5 feet, width 4 feet, and height 3 feet.
The volume of the rectangular prism between the two tanks is:
V = (20 x 8 x 6) - (5 x 4 x 3)
V = 960 - 60
V = 900 cubic feet
To find the amount of oxygen needed to fill this space with a density of 0.0827 pounds per cubic foot, we can multiply the volume by the density:
m = V x d
m = 900 x 0.0827
m ≈ 74.43 pounds
Therefore, approximately 74.43 pounds of oxygen is required to meet the density requirement.
Answer: 74 pounds
Step-by-step explanation:
(20*8*6) - (5*4*3)
960-60
v=900 ft3
density=0.0827
mass=0.0827*900
Mass is 74 pounds
PLEASE HELP ASAP
(Perimeter and Area on the Coordinate Plane MC) Which of the following is the fourth vertex needed to create a rectangle with vertices located at (–5, 3), (–5, –7), and (5, –7)? (5, –3) (5, 3) (–5, 7) (–5, –3)
Step-by-step explanation:
To create a rectangle with vertices located at (-5, 3), (-5, -7), and (5, -7), we need to find the fourth vertex that completes the rectangle. Since opposite sides of a rectangle are parallel and congruent, we can determine the missing vertex by finding the midpoint of either of the two given sides and then moving in the direction perpendicular to that side by the length of the other side.
The given sides are:
Side 1: (-5, 3) to (-5, -7), which has length 3 - (-7) = 10
Side 2: (-5, -7) to (5, -7), which has length 5 - (-5) = 10
Since the sides are congruent, we can find the midpoint of Side 1 as:
Midpoint of Side 1 = [(-5 + (-5))/2, (3 + (-7))/2] = [-5, -2]
To find the missing vertex, we need to move from (-5, -2) in the direction perpendicular to Side 1 by a distance of 10 units (the length of Side 2). Since Side 2 is horizontal, we need to move vertically. We can do this by adding or subtracting 10 from the y-coordinate of the midpoint of Side 1, depending on whether we want to move up or down. In this case, we want to move down, so we subtract 10:
Missing vertex = [-5, -2 - 10] = [-5, -12]
Therefore, the fourth vertex needed to create a rectangle with vertices located at (-5, 3), (-5, -7), and (5, -7) is (-5, -12).
please help The triangle below is isosceles. Find the length of side x in simplest radical form with a rational denominator
Answer:
x = 3√2
Step-by-step explanation:
You want the length x of the hypotenuse of an isosceles right triangle with sides of length 3.
Isosceles right triangleThe two legs of an isosceles right triangle are congruent. The length of the hypotenuse can be found from the Pythagorean theorem:
x² = 3² +3²
x² = 3²·2
x = √(3²·2) = 3√2
The length of side x is 3√2.
__
Additional comment
A isosceles right triangle is one of two "special" right triangles. The ratios of its side lengths are 1 : 1 : √2. This tells you the hypotenuse is √2 times the side length, as we found above.
The other "special" right triangle is the 30°-60°-90° triangle. Its side lengths have the ratios 1 : √3 : 2. Both of these are seen often in algebra, trig, and geometry problems.