On the first test, the mean is 70, the standard deviation is 5, and your score is 80. on the second test, the mean is 70, the standard deviation is 15, and your score is 85. compared to other students, how well did you do on the two tests?
85+88+87+80+x all divided by 5= 82
340+x=410
410-340=70
What size does the radius of a sphere need to be for its volume to be larger than its surface area? HINT! It is less than 10. HINT! It is NOT a whole number. If you can show me a whole number for a radius where the surface area and volume are equal, then any radius bigger than that will have a larger volume.
To get full points you will need to SHOW me formulas for surface area of a sphere, volume of a sphere, and calculations on how you found your answer.
un joyero vende 13 anillos de oro y 18 de plata por 9405 euros. sabiendo que el anillo de oro cuesta el triple que el de plata ¿cual es el precio de cada anillo?
Determine whether quantities vary directly or inversely and find the constant of variation. If 5 bushels of wheat weigh 136 kg, how much do 3.5 bushels of wheat weigh?
Let the bushels of wheat is b and weight of the wheat is w.
We can say that more the bushels of wheat more will be the weight of the wheat.
Hence, the quantities vary directly.
Therefore, we have
[tex]b=kw[/tex], where k is the constant of variation.
Now, we have been given that 5 bushels of wheat weigh 136 kg. Thus, we have
[tex]5=136k\\ \\ k=\frac{5}{136}[/tex]
Thus, the constant of variation is [tex]\frac{5}{136}[/tex]
Now, we have been given 3.5 bushels of wheat. Hence, we have
[tex]3.5=\frac{5}{136} w\\ \\ w=\frac{136\times 3.5}{5} \\ \\ w=95.2[/tex]
Therefore, 3.5 bushels of wheat weigh 95.2 kg
Can someone help me in this trig question, please? thanks
A person is on the outer edge of a carousel with a radius of 20 feet that is rotating counterclockwise around a point that is centered at the origin. What is the exact value of the position of the rider after the carousel rotates 5pi/12
The exact value of the position of the rider after the carousel rotates 5π/12 is 5 (-√2 + √6), 5(√2 + √6).
The positionSince the position of the carousel is (x, y) = (20cosθ, 20sinθ) and we need to find the position when θ = 5π/12 = 5π/12 × 180 = 75°
So, substituting the value of θ into the positions, we have
(20cos75°, 20sin75°)
The value of 20cos75°
20cos75° = 20cos(45 + 30)
Using the compound angle formula
cos(A + B) = cosAcosB - sinAsinB
With A = 45 and B = 30
cos(45 + 30) = cos45cos30 - sin45sin30
= 1/√2 × √3/2 - 1/√2 × 1/2
= 1/2√2(√3 - 1)
= 1/2√2(√3 - 1) × √2/√2
= √2(√3 - 1)/4
= (√6 - √2)/4
= (-√2 + √6)/4
So, 20cos75° = 20 × (-√2 + √6)/4
= 5 (-√2 + √6)
The value of 20sin75°
20sin75° = sin(45 + 30)
Using the compound angle formula
sin(A + B) = sinAcosB + cosAsinB
With A = 45 and B = 30
sin(45 + 30) = sin45cos30 + cos45sin30
= 1/√2 × √3/2 + 1/√2 × 1/2
= 1/2√2(√3 + 1)
= 1/2√2(√3 + 1) × √2/√2
= √2(√3 + 1)/4
= (√6 + √2)/4
= (√2 + √6)/4
So, 20sin75° = 20 × (√2 + √6)/4
= 5(√2 + √6)
Thus, (20cos75°, 20sin75°) = 5 (-√2 + √6), 5(√2 + √6).
So, the exact value of the position of the rider after the carousel rotates 5π/12 is 5 (-√2 + √6), 5(√2 + √6).
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Ethan correctly answers 80% of the total questions on his history test. He correctly answers 32 questions. What is the number of questions on Ethan's history test?
Name three properties that a square and a rhombus share.
Eight pounds of ground beef are divided into quarter-pound hamburger patties. How many hamburger patties are there in total?
sketch one cycle of the cosine function y=-cos 3 theta
Answer with explanation:
The given cosine function is
y= - cos 3 (theta)= -3 cos A, where , theta =A.
→→Domain of Cos A
= All Real number
= Period is from (-π , π)
Range of Cos A=[-1, 1]
→Domain of Cos 3 A,will be also, all real number.
Period is from,
[tex][\frac{-\pi}{3},\frac{\pi}{3}][/tex]
But range of Cos 3A,will be same as ,Cos A which is equal to ,[-1,1].
→Plotted the graph of ,y=-cos 3 A, having cycle ,
[tex][\frac{-\pi}{3},\frac{\pi}{3}][/tex]
HELP!! Drag values to complete each equation.
Answer:
a.[tex]((12)^2)^3\cdot (12)^{-4}=12^2[/tex]
b.[tex]\frac{(12)^7\cdot (12)^{-5}}{(12)^2}=1[/tex]
Step-by-step explanation:
We have to complete each equation
We are given that
[tex]((12)^2)^3\cdot (12)^{-4}[/tex]
[tex](12)^6\cdot (12)^{-4}[/tex]
Using identity
[tex](a^x)^y=a^{xy}[/tex]
[tex](12)^{6-4}=(12)^2[/tex]
Using identity: [tex]a^x\cdot a^y=a^{x+y}[/tex]
[tex]((12)^2)^3\cdot (12)^{-4}=12^2[/tex]
b.[tex]\frac{(12)^7\cdot (12)^{-5}}{(12)^2}[/tex]
[tex]\frac{(12)^2}{(12)^2}[/tex]
[tex](12)^{2-2}=(12)^0=1[/tex]
Using identity: [tex]\frac{a^x}{a^y}=a^{x-y},a^0=1[/tex]
[tex]\frac{(12)^7\cdot (12)^{-5}}{(12)^2}=1[/tex]
The length of a rectangle is increasing at a rate of 6 cm/s and the width is increasing at a rate of 4 cm/s. when the length is 16 cm and the width is 12 cm, how fast is the area of the rectangle increasing?
CAN SOMEONE HELP ME ON THIS
Please someone help Me with this problem. I really need help.
A car is traveling at 48 miles per hour. What is the speed of the car in centimeters per second? (1 mile = 5,280 feet, 1 foot = 12 inches, 1 centimeter = 0.39 inch)
A car is traveling at 48 miles per hour. What is the speed of the car in centimeters per second? (1 mile = 5,280 feet, 1 foot = 12 inches, 1 centimeter = 0.39 inch)
Solution:
We have 48 [tex] \frac{miles}{hour} [/tex]
To convert, miles to centimeters.
Let us convert miles to feet and then inches and then centimeters.
1miles=5280feet
And, 1 foot=12inches
So, 5280 feet or 1 miles =12*5280inches
So, 1miles=63360inches
Now, Let us convert inches to centimeters
1centimeter=0.39inches
Or, 1 inch= [tex] \frac{1}{0.39} [/tex] centimeter
So, 63360inches (or 1 mile)= [tex] \frac{63360}{0.39} [/tex] centimeter
1mile or 63360inches=162461.54centimeter
1mile=162461.54 centimeter
We have, 48 [tex] \frac{miles}{hour} [/tex]
We have, 48 *[tex] \frac{162461.54 centimeter}{60minutes} [/tex]
We have, 48* [tex] \frac{162461.54 centimeter}{60*60seconds} [/tex]
So, We have, 48* [tex] \frac{162461.54 centimeter}{3600seconds} [/tex]
=48*[tex] \frac{162461.54}{3600} [/tex][tex] \frac{centimeters}{second} [/tex]
=48*45.13[tex] \frac{centimeters}{second} [/tex]
=2166.15[tex] \frac{centimeters}{second} [/tex]
Answer:= Speed of the car in centimeters per second is 2166.15 centimeters/second
A restaurant manager recorded the number of people in different age groups who attended her food festival: Histogram with title Food Festival Participants, horizontal axis labeled Age Group (yr) with bins 0 to 19, 20 to 39, 40 to 59, and 60 to 79 and vertical axis labeled Number of People with values from 0 to 60 at intervals of 10. The first bin goes to 20, the second goes to 40, the third goes to 60, and the last goes to 50. Which of the following frequency tables represents the data in the histogram accurately? Age Group (year) Number of People 0–19 20 20–39 60 40–59 40 60–79 50 Age Group (year) Number of People 0–19 20 20–39 60 40–59 50 60–79 40 Age Group (year) Number of People 0–19 20 20–39 40 40–59 60 60–79 50 Age Group (year) Number of People 0–19 60 20–39 20 40–59 40 60–79 50
Answer:
There are 3 times as many participants in the 40-59 age group than the 0-19 age group.
Step-by-step explanation:
Because when we take 20 and times it by three we get 60 and the 40-59 age group is 60 so there you go. Hope This Helps:) Brain-list would be greatly appreciated.
Subtract.
(x + 1) − (−2x − 5)
Answer:
3x+6
Step-by-step explanation:
you have to distribute the negative to get the parentheses away and simplify
You spend 60 on clothes and buy 3 dvd movies. your friend spends nothing on clothes and buys 8 dvd movies. you both spend the same amount of money. how much does each dvd movie cost?
Each DVD movie costs $12. This is calculated by setting up and solving an equation where the total spending on clothes and 3 DVDs equals the spending on 8 DVDs, as both parties spent the same amount.
To find out how much each DVD movie costs, we need to set up an equation based on the given information. You spent $60 on clothes and bought 3 DVD movies, while your friend spent $0 on clothes and bought 8 DVD movies. It is given that both of you spent the same amount of money. Let's denote the cost of each DVD movie as x.
The total amount you spent is the cost of the clothes plus the cost of the 3 DVD movies, which can be expressed as $60 + 3x. Your friend spent the cost of the 8 DVD movies, which is 8x. Since both amounts are equal, we have:
60 + 3x = 8x
Solving this equation for x:
Subtract 3x from both sides: 60 = 5xDivide both sides by 5: x = $12Therefore, the price of each DVD movie is $12.
An equiangular triangle can be scalene. A. True B. False
can someone help me on trigonometry ?
what are a) the ratio of the perimeters and b) the ratio of the areas of the larger figure to the smaller figure? the figures are not drawn to scale. a. 13/3 and 169/9 b. 13/3 and 16/9 c. 16/3 and 169/9 d. 16/3 and 16/9
Help Asap! 30 Points!
What is the volume of this sphere? r = 2.5 m
Which regular polygon would have each of its interior angles measure 120°? hexagon heptagon octagon nonagon?
At noon joyce drove to the lake at 30 mph, but she made the long walk back home at 4 mph. how many hours did she walk if she was gone for 17 hours
Answer:
i just did this on a quiz the answer was 15 hours
Step-by-step explanation:
Ms. Acosta received a job as a teacher with a starting salary of $34,000. According to her contact, she will receive a 1.5% increase in her salary every year. How much will Ms. Acosta earn in 7 years
A math book sells for $106.50. (a) find the amount of sales tax, to the nearest cent, if the sales tax rate is 8.5%. (b) find the total purchase price
NEED HELP ASAP!
Subtract.
(4x^2+8x−2)−(2x^2−4x+3)
Answer in standard form
If p(x) = 2x^3 - 3x + 5, what is the remainder of p(x) divided by (x - 5)
Final answer:
Using the Remainder Theorem, after substituting 5 into the polynomial p(x), we find that the remainder when p(x) is divided by (x - 5) is 240.
Explanation:
To find the remainder of p(x) divided by (x - 5), we can use the Remainder Theorem. The Remainder Theorem states that the remainder of a polynomial p(x) divided by (x - a) is p(a). Thus, we need to evaluate p(5).
Let's substitute x with 5 in the polynomial p(x):
p(5) = 2(5)^3 - 3(5) + 5
= 2(125) - 15 + 5
= 250 - 15 + 5
= 240.
Therefore, the remainder when p(x) is divided by (x - 5) is 240.
what expression is equivalent to the division expression 3/4 divided by 4/5
Answer:
3/4 ÷ 4/5 = .75 ÷ .80
Step-by-step explanation:
3/4 ÷ 4/5
= .75 ÷ .80
= 0.9375
Factor completely: 6b - 8ab + 15 - 20a
The measure of an angle is 8 times the measure of its complement. tina writes an equation and finds the correct measure of each angle. which shows the equation tina could have written and the angle measures she could have found?
The measure of angles are 10 and 80 degree.
What is Algebra?A branch of mathematics known as algebra deals with symbols and the mathematical operations performed on them.
In order to determine the values, these symbols are also subjected to various addition, subtraction, multiplication, and division arithmetic operations.
We have,
let the complementary angle = x
and, the another angle is = 8x
We know the complementary angle sum to 90 degree.
So, x + 8x = 90
9x = 90
x =10
Thus, the measure of angles are 10 and 80 degree.
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