All categories

3 years ago

Please help with this too

Mathematics

1 answer:

vovikov84 [41]3 years ago

8 0

Answer:

Step-by-step explanation:

Garden roller is in the shape of cylinder.

So, one revolution = Curved surface area of the cylinder

diameter = 70 cm

radius = 70/2 = 35 cm

h = 100 cm

Curved surface area of the cylinder = 2πrh

= $2*\frac{22}{7}*35*100$

= 22000 square cm

Area covered in 15 revolutions = 15 * 22000

= 330000 square cm

2) Coin

diameter = 22 mm

r = 22/2 = 11 mm

Volume of coin = 66 mm

πr²h = 66

$\frac{22}{7}*11*11*h=66\\\\\\h=\frac{66*7}{11*11*22}\\h=0.17 mm$

You might be interested in

What would you Estimate 0.49

love history [14]

Answer:

. 50

Step-by-step explanation:

You would round to the closest number

. 49 is closer to. 50 than. 40

5 0

3 years ago

Read 2 more answers

suppose you have $11000 to invest. which of the two rates would yield the larger amount in 5 years: 6% compounded monthly or 5.8

umka21 [38]

Answer:

6% monthly

Step-by-step explanation:

The monthly rate being compounded when the interest is 6% per year is ...

6%/12 = 0.5%

so the multiplier each month is

1 + 0.5% = 1.005

___

The monthly multiplier when 5.86% is compounded continuously is ...

e^(5.86%/12) ≈ 1.004895

The 6% rate will give a larger yield after any length of time.

6 0

3 years ago

The sphere area of a sphere is 200.96 square centimeters. What is the approximate volume of the sphere? Use 3.14 for pi. Round y

julsineya [31]

We are given

area of sphere is 200.96cm^2

it means that we are given surface area

so, we can use surface area formula

$S=4\pi r^2$

where S is surface area

r is radius

so, firstly we need to find radius or r

$200.96=4\pi r^2$

we can solve for r

$r=3.9989cm$

now, we can find volume

$V=\frac{4}{3} \pi r^3$

we can plug r

$V=\frac{4}{3} \pi (3.9989)^3$

now, we can find volume

$V=267.86cm^3$ .............Answer

7 0

3 years ago

Find the Value of X Please

Yanka [14]

Answer:

x=6

Step-by-step explanation:

3x-5=2x+1

x-5=1

x=6

6 0

3 years ago

Iris wants to buy sneakers at $15 each and high heels at $30 each. Write an algebraic expression to find the total cost of the s

kogti [31]

Answer: 30y + 15x

If x is for sneakers, and y is for high heels, plug 15 in for a and 30 in for b. This means that x is how many sneakers she buys, and y is how many high heels she buys. The equation altogether represents the total amount of her purchases.

5 0

3 years ago

Please help with this too​

Please help with this too