Answer:
B. Stratified random sample is the correct answer
The best sampling method that describes the scenario where students from each grade (6th, 7th, and 8th) are randomly chosen in a sample of 15 students from each grade is B) stratified random sample.
In a stratified random sample, the population is divided into distinct groups or strata based on certain characteristics, and then a random sample is taken from each stratum. In this case, the distinct groups are the different grade levels (6th, 7th, and 8th grades). By randomly selecting 15 students from each grade, we ensure representation from each grade level in the sample.
This method allows for a more accurate representation of each grade level within the sample and can provide valuable insights into the characteristics and experiences of students in each grade.
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What is the volume of a ball if its diameter is 6 inches? Leave your answer in terms of π.
A) V = 12 π cubic inches
B) V = 36 π cubic inches
C) V = 288 π cubic inches
D) V = 27.75 π cubic inches
Answer:
B
Step-by-step explanation:
I am assuming that this ball is a perfect sphere.
The volume of a sphere is [tex]\frac{4}{3} *\pi *r^3[/tex]
We have the diameter, and in order to find the radius, we just have to divide by 2. 6/2=3. Now, we have to plug in the 3 to the equation.
[tex]\frac{4}{3} *\pi *3^3[/tex]
3 cubed is 27, so now we have [tex]\frac{4}{3} *\pi *27[/tex]
27*4/3*pi=36pi
An observer in the lighthouse is 70 feet above the water. He sites two boats in the water directly in front of him. The angle of depression to the nearest boat is 35°. The angle of depression to the other boat is 18°. What is the distance between the two boats? Round to the nearest foot
Answer:
62 feet. looked it up.
Step-by-step explanation:
Have a great day! :)
A 1.5m tall boy casts a 3m shadow. Calculate the height of a tree that simultaneously casts an 8m shadow.
A map has a scale of 2 in. = 16 mi. If you measured the distance between two cities to be 19 in. on the map, how many miles would it actually be?
Answer:
Step-by-step explanation:
2 in/16mi = 19 in/x mi
152 mi
Answer:
16 miles = x miles
(1/2) inch 2 3/4 inches
x = (11/4) * 16 = (11/4) * 2 * 16 = 88 miles
(1/2)
Step-by-step explanation:
As was the case in your previous question, this problem involves setting two ratios equal to each other. We call such an equation a proportion.
help ASAP For brainlessly
Answer:
C
Step-by-step explanation:
The inequality says greater than or equal to 8, which means the first two are automatically ruled out because they are both less than/equal to.
Then look at C and D, D starts at 3 and C starts at 8 so the answer should be C
Help pls and no links
We know a or b != 0
but a-b==0 so both are the same unknown number
b/a must = 1
so
a/b is equivalent to b/a as a/b=1 as well.
So the last answer choice.
what is the probability that a soccer play and a hockey player would be randomly chosen , that they would both be wearing blue
Answer:
5 out of 10%
Step-by-step explanation:
Answer:
not enough information
Step-by-step explanation:
you need to know how many soccer players and how many hockey players there are and out of that how many of them are wearing blue
in 3/4 of an hour Ryan codes 3/5 of his game. at this rate how much of the game can he code in 1 hour
Answer:
In one hour, he can code 4/5, 80%, of the game.
Step-by-step explanation:
If he can code 3/5 of his game in 3/4 hour, 60% in 45 minutes, he can code 20% every 15 minutes.
PLEASE HELP!!! I don't understand.
If a_n is a sequence that includes the terms:
250, ___, 10
What missing number(s) would the missing term be if:
a) a_n is arithmetic
b) a_n is geometric
9514 1404 393
Answer:
arithmetic: 130geometric: ±50Step-by-step explanation:
Arithmetic sequence
The terms of an arithmetic sequence have common difference. If the missing term is x, then the difference between terms is the same:
x -250 = 10 -x
2x = 260 . . . . . . add 250+x to both sides
x = 130 . . . . . . . . divide by 2
The missing term of an arithmetic sequence is 130.
(the common difference is -120)
__
Geometric sequence
The terms of a geometric sequence have a common ratio. If the missing term is x, then the ratios between terms are the same:
x/250 = 10/x
x^2 = 2500 . . . . . . . multiply both sides by 250x
x = ±√2500 = ±50 . . . take the square root
The missing term of a geometric sequence is +50 or -50.
(the common ratio is ±1/5)
I needddd helppppp !!!what’s the answer ?
Answer:
cosA = [tex]\frac{8}{17}[/tex]
Step-by-step explanation:
Using the identity
cosA = [tex]\frac{1}{secA}[/tex] = [tex]\frac{1}{\frac{17}{8} }[/tex] = [tex]\frac{8}{17}[/tex]
Answer:
8/17
Step-by-step explanation:
sec A = Hypotenuse/ Adjacent = 17/8
cos A = Adjacent / Hypotenuse = 8/17
Hope this helps
A survey asked 100 adults about car ownership and ride-sharing apps. Of the 38 people without a car, 29 have ride-sharing app on their phone. A total of 47 people have a ride-sharing app on their phone.
What percentage of people surveyed who own a car have a ride-sharing app on their phone? Round to the nearest whole percent.
Enter the correct answer in the box.
Answer:
it should be 18%
Step-by-step explanation:
LINKS WILL BE REPORTED ALONG WITH NONSENSE ANSWERS THANK YOU
Please help me with this, I understand how to do the first equation but not the second (the one where it says he sold more accessories than phone commissions) Brainliest will be given!
what's ur ig bestie? it's making me write it longer so hihihi
Help please n thank u
Answer:
97.4
Step-by-step explanation:
What is the midpoint of the vertical line segment graphed below? (2, 4), (2, -9) A. (4, -5). B. (2, -5/2). C. (2, -5). D. (4, 5/2)
Answer:
B. [tex] (2, -\frac{5}{2}) [/tex]
Step-by-step explanation:
Given:
(2, 4) and (2, -9)
Required:
Midpoint of the vertical line with the above endpoints
Solution:
Apply the midpoint formula, which is:
[tex] M(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}) [/tex]
Where,
(2, 4) = (x_1, y_1)
(2, -9) = (x_2, y_2)
Plug in the values into the equation:
[tex] M(\frac{2 + 2}{2}, \frac{4 + (-9)}{2}) [/tex]
[tex] M(\frac{4}{2}, \frac{-5}{2}) [/tex]
[tex] M(2, -\frac{5}{2}) [/tex]
As she drove down the icy road, Mrs. Campbell slammed on her brakes. Her car did a 360. Explain what happened to Mrs. Campbell's car.
Answer:
Step-by-step explanation:
Her car doing a 360 means that the car turned in a manner akin to going round a full circle. This is because, she was moving on an icy way. Ice have been known to be slippery, and thus, stepping on the brakes unexpectedly would have made the car tilt a bit, which then increased to turning sideways, and an eventually full circle turning. This full circle turning is what is being referred to as 360
The polynomial is (x-2) is a factor of the polynomial 4x^2-6x-4
A. True
B. False
True, (x-2) is a factor of the polynomial 4x^2-6x-4. Option A is correct.
What exactly is a polynomial?A polynomial is an algebraic statement made up of variables and coefficients.
Variables are sometimes known as unknowns. We can use arithmetic operations like addition, subtraction, and so on. However, the variable is not divisible.
Given equation;
[tex]\rm 4x^2-6x-4[/tex]
The factors of the given equation:
2(2x+1)(x−2)
True, (x-2) is a factor of the polynomial 4x^2-6x-4.
Hence option A is correct.
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Cheryl made a one-time deposit at Eagle Savings & Loan of $6,400. The bank offers a 4.5% interest rate compounded annually. What is the amount of interest Cheryl will earn at the end of 5 years? help please ((:
Answer: I am truly sorry for doing this.
Step-by-step explanation:
Suppose that a family has an equally likely chance of having a cat or a dog. If they have two pets, they could have 1 dog and 1 cat, they could have 2 dogs, or they could have 2 cats.
What is the theoretical probability that the family has two dogs or two cats?
Describe how to use two different coins to simulate which two pets the family has.
Flip both coins 50 times and record your data in a table like the one below.
Result Frequency
Heads, Heads
Heads, Tails
Tails, Heads
Tails, Tails
Total 50
Based on your data, what is the experimental probability that the family has two dogs or two cats?
If the family has three pets, what is the theoretical probability that they have three dogs or three cats?
How could you change the simulation to generate data for three pets?
The theoretical probability that the family has two dogs or two cats is 1/3.
(branliest will be appreciated)
Which points are on the graph of the line 32 +6y=18? Check all that apply.
(-2,4)
(0,3)
0 (0,6)
(3,0)
0 (4, -2)
(6,0)
Activate
What is the slope and y-intercept of the following equation: 5x - 3y = 36
Answer:
y=5/3x-12
slope= 5/3
y-intercept= -12
Step-by-step explanation:
i hope this helps :)
PLZZZZ HELP ME ,Plsss
Answer:
V = 72 ft³
Step-by-step explanation:
V = (3 x 8 x 2) + (4 x 2 x 3) = 72 ft³
Answer:
Try 1,152
Step-by-step explanation:
I think you have to multiply all the numbers and get 1,152. I'm not that good at math but.
The lenght of one side rectangle is x cm the length of longer side is (X+4) cm if the rectangle has the peimeter of 48 cm find the area?
Answer: 140cm²
Step-by-step explanation:
Perimeter of a rectangle is calculated as: = 2(length + width)
where,
Length = x+4
Width = x
Therefore, perimeter = 2(length + width)
2(x + x+4) = 48
2(2x + 4) = 48
4x + 8 = 48
4x = 48 - 8.
4x = 40
x = 40/4
x = 10cm
The other side = x+4 = 10+4 = 14cm
Area = length × width
Area = 10cm × 14cm
Area = 140cm²
Program the VR Robot to drive in a square. Make each side of the square 3 grid squares long. What is the area of your square in mm? Use a calculator and/or pencil and paper to find out.
Answer:
9 mm squared
Step-by-step explanation:
hope this helps, lol :b
The radius of a circle measures 11cm. what is the circumference of the circle?
Answer:
C = 69.08
Step-by-step explanation:
C = 2πr
C = 22π or 69.08
Evalue without using a calculator
Answer:
square root of 2
Step-by-step explanation:
Can someone pleaseeee help and if you’re correct i’ll give brainliest
Answer:
The last one
Step-by-step explanation:
Pentagon has 5 sides, it only has 4 sides.
The path of a rope bridge can be modeled by a quadratic equation h(l), where h is the height at a point on the bridge relative to the two ends of the bridge and l is the distance from one end of the bridge. One such bridge connects two ends that are 24 meters apart. The lowest point of the bridge is 3 meters lower than the two ends of the bridge Assuming the two ends of the bridge are at an equal height of h = 0 meters, which of the following graphs could be the graph of h (l)?
Please help me find the perimeter for the composite figure.
Answer:
A 10.28in
Step-by-step explanation:
Find the perimeter of the circle first. Because there are two half-circles, you can just find the circumference of one whole circle. 2πr is the formula. r is the radius. The circumference of the circle is 2π or 6.28.
Then add the two sides of the square. It is 2+2=4. Add 6.28 and 4.
A delivery truck covers a distance of 50 miles every hour. Write the equation that represents, d, the truck has covered over h hours.
Answer:
50 times h=d
Step-by-step explanation:
The heights of all 12-year old girls in the U.S. Are normally distributed with a mean of 60.5 inches and a standard deviation of 3 inches. What is probability that a girl chosen at random from a that age group with have a height of at least 69.5 inches?
