MATHEMATICS MIDDLE SCHOOL

What is 28% of 80? please answer as a decimal
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Answers

Answer 1
Answer:

Answer:

22.4

Step-by-step explanation:

Is means equals and of means multiply

W = 28% * 80

Change to decimal form

W = .28 * 80

W = 22.4

28 percent of 80 is 22.4
Answer 2
Answer:

Answer:

22.4

Step-by-step explanation:

80/x = 100/28

80/x = 3.57142857143

times both sides by x

x cancels out on the left and leaves on the right 3.57142857143x

80/3.57142857143 = x

22.4 = x

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A cone and cylinder have the same height and the same base radius. If the volume of the cylinder is 81 cm^3 what is the volume of the cone in cm^3?A) 9
B) 27
C) 78
D)243

Answers

Answer:

The volume of the cone is 27cm^3

Step-by-step explanation:

We know that formulas

Volume of cylinder is

V_1=\pi r^2 h

Volume of cone is

V_2=(1)/(3)\pi r^2 h

we are given

A cone and cylinder have the same height and the same base radius

So, both will have same radius and height

now, we can find ratios

(V_2)/(V_1)=((1)/(3)\pi r^2h )/(\pi r^2h)

now, we can simplify it

(V_2)/(V_1)=(1)/(3)

we are given

the volume of the cylinder is 81 cm^3

so, V_1=81

now, we can plug it and solve for V2

(V_2)/(81)=(1)/(3)

81* (V_2)/(81)=81*(1)/(3)

V_2=27

So, the volume of the cone is 27cm^3

A jeweler who buys a ring from a jewelry maker for $125 marked with the price by 135% for sale in the store what is the selling price of the ring with 7.5 sales tax

Answers

marked up by 135% means
new price=original price+(original price times markup) =125+(125 times 1.35)=293.75
tax
293.75 times 0.075=22.03125

293.75-22.03125=271.718 so aprox $271.72


selling price would be $271.72
selling price would be $271.72

A rectangle has an area of 4 square meters. The width is 1/5 meter. What is the length of the rectangle?

Answers

Given:
Area of a rectangle = 4 square meters
wight = 1/5 meter

find the length

Area of a rectangle = length * width

length = area / width
length = 4 m² ÷ 1/5 m
length = 4 m² * 5/1m 
length = 20 m

length is 20 meters.

Area = 20 m * 1/5 m = 20 m² / 5 = 4m²

What is the exact volume of a sphere that has a radius of 7.5 ft?

___π ft3

Answers

volume of sphere=4/3 times pi times radius^3
4/3 times pi times 7.5^3=562.5pi

the answer is 562.5π ft^3

Does anyone know the answer ?

Answers

The second one it's double.

What is the reciprocal of (1/7)?

Answers

Answer:

0.14285714285

Step-by-step explanation:

pls mark as brainliest!!!
Answer:
7

Explanation:
The reciprocal of a number is to switch the numerator and denominator. In (1/7), the numerator is 1 and the denominator is 7. A fraction is always numerator/denominator. So, when (1/7) is flipped, the fraction’s reciprocal is (7/1) which is simplified to 7.
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