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3 years ago

Whats the rate and unit rate of 28 dollars un four weeks

Mathematics

1 answer:

inna [77]3 years ago

7 0

Answer:

Step-by-step explanation:

Divide 28 by 4 to get the one week rate. 28/4 = 7.

$7 in one week.

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What happens to the volume of a sphere when the radius is multiplied by 4?

tekilochka [14]

Vsphere=(4/3)pir^3
Voriginal=(4/3)pir^3

when radius is multiplied by 4
replace r with 4r
Vnew=(4/3)pi(4r)^3
Vnew=(4/3)pi(64r^3)
Vnew=(64)(4/3)pir^3
Vnew=(64)(Voriginal)
the volume is 64 times the original

5 0

3 years ago

Mexine can stack 20 boxes in 15 minutes. how long will it take her to stack 100 boxes

Charra [1.4K]

Lets use a rule of three simple with direct proportion to solve:
20 boxes -----> 15 min
100 boxes ----> x
x = (100)(15)/20
x = 75
therefore it takes 75 mins to stack 100 boxes

If we use fractions to solve:
15/20 = x/100
and solve for x.
20/15 = 100/y
solve for y

7 0

3 years ago

SOMEONE HELP I'LL MARK CORRECT ANSWER BRAINLY

Liono4ka [1.6K]

Answer:

Step-by-step explanation:

6 0

3 years ago

The volume of a cylinder is 300 feet3. Find the volume of a cone and a sphere that have the same height and radius as the cylind

nikitadnepr [17]

The formula of a volume of a cylinder:

$V_{cylinder}=\pi r^2H$

The formula of a volume of a cone:

$V_{cone}=\dfrac{1}{3}\pi r^2H$

Therefore, if a cone has the same radius and height like a cylinder, then the volume of a cone is three times smaller than the volume of a cylinder.

Therefore we have:

$V_{cone}=\dfrac{1}{3}V_{cylinder}\to V_{cone}=\dfrac{1}{3}(300)=100\ ft^3$

The formula of a volume of a sphere:

$V_{sphere}=\dfrac{4}{3}\pi R^3$

If a cone has that same lengths of a radius and a height, then the formula of a volume is:

$V_{cone}=\dfrac{1}{3}\pi r^2r=\dfrac{1}{3}\pi r^3$

If a cone and a sphere have the same radius, then the volume of a sphere is four times greater than a volume of a cone.

Therefore we have:

$V_{sphere}=4(100)=400\ ft^3$

6 0

3 years ago

Rusty's hair grows at the rate of 1 over 4 inches per month.

vichka [17]

1/4 = 2/8. Remember that. This means that 1/8 is equal to half of a month. It there is 5/8, you can add a half month for every eight. In this case, it will take 2 and a half months

Hope this helped!!!!

4 0

4 years ago

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