MATHEMATICS MIDDLE SCHOOL

help me wit these 3 questions plz.

A cone has a base radius of 7 centimeters and a height of 21 centimeters.

 

What is the volume of the cone?

        A.

28π cm3

      B.

49π cm3

      C.

147π cm3

      D.

343π cm3
mjchey avatar

Answers

Answer 1
Answer: 1. Cone

r=7cm
h=21cm

V= (\pi*r^2*h)/(3)=(\pi*7^2*21)/(3)=7^2*7*\pi=7^3\pi=343{\pi}cm^3

Answer: D

2. Cylinder

r=5ft
h=16ft

V= \pi*r^2*h=\pi*5^2*16=25*16\pi=400\pi ft^3

Answer: A

3.Pyramid

In this case it will be

V= (a*b*h)/(3)

a=9ft
b=4ft
h=12ft

V= (4*9*12)/(3)=4*3*12=144 ft^3

Answer: B

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126 is decreased to 48 percent of change

Answers

100-48=52
52% of 126=0.52 times 126=65.52

How do I solve A B C ?

Answers

Answer:

see explanation

Step-by-step explanation:

The diagonals of a parallelogram bisect each other.

Thus CO = OA = a

(a)

CA = CO + OA = a + a = 2a

(b)

AB = AO + OB = - a + b = b - a

(c)

BC = BO + OC = - b - a

Answer:

(a) CA=CO+OA=a+a=2a

(b) AB=AO+OB=-a+b=b-a

(c) BC=BO+OC=-b-a

Step-by-step explanation:

a) CA=CO+OA=a+a=2a

(b) AB=AO+OB=-a+b=b-a

(c) BC=BO+OC=-b-a

Is 12 or -12 closet to 0

Answers

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It takes 28 minutes for 7 people to paint 7 walls.How many minutes does it take 14 people to paint 14 walls?

Answers

Answer: 28 minutes


Step-by-step explanation:

If M1 men can do W1 work in working H1 hours per day and M2 men can do W2 work in working H2 hours per day (where all men work at the same rate), then

(M_1H_1)/(W_1)=(M_2H_2)/(W_2)\n\Rightarrow(7*28)/(7)=(14H_2)/(14)\n\Rightarrow(28)/(1)=H_2\n\Rightarrow\ H_2=28

hence, It takes 28 minutes for 14 people to paint 14 walls.
Well, since you have twice as many people and twice as many walls. It would take them also 28 minutes to paint all the walls.
Hope I helped!

0.83 compared 83/100

Answers

" 0.83 " MEANS " 83/100 ". They are identical quantities, because they are the SAME quantity.

What is 4.386 when rounded to the nearest tenth?

Answers

4.486 because you would look at the 8 and it is over 5 so you round up to the 3 and it become 4. But if it was less them you would keep it the same.

your welcome


It would 4.4 because 3 is in the tenths place sp you look at the number behind it
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