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3 years ago

I need help with this

Mathematics

1 answer:

sergij07 [2.7K]3 years ago

4 0

Answer:

What are you trying to find?

Step-by-step explanation:

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PLEASE HELP!

IrinaVladis [17]

Answer:

Step-by-step explanation:

<h3>Sphere:</h3>

1) a) r = 7 cm

$\sf \boxed{\text{Volume of sphere=$\dfrac{4}{3}\pi r^3$}}$

$\sf =\dfrac{4}{3}*3.14*7*7*7\\\\= 1436 \ cm^3$

$\sf \boxed{\text{\bf Surface area of sphere = $4\pi r^2$}}$

= 4*3.14 * 7 * 7

= 615.44 cm²

b) r= 8.4 cm

$Volume = \dfrac{4}{3}\pi r^3$

$\sf =\dfrac{4}{3}*\dfrac{22}{7}*8.4*8.4*8.4\\\\= 2483.7 \ cm^3$

Surface area = 4*3.14*8.4*8.4

= 887.04 cm²

<h3>Hemisphere:</h3>

a) r = 6 cm

$\sf \boxed{\text{\bf Volume of hemisphere =$\dfrac{2}{3} \pi r^3$}}$

$\sf =\dfrac{2}{3}*3.14*6*6*6\\\\= 452.16 \ cm^3$

$\sf \boxed{\text{\bf Surface area of hemisphere=3 \pi r^2}}$ $\sf \boxed{\text{\bf Surface area of hemisphere = $3 \pi r^2$}}$

= 3 * 3.14 * 6 * 6

= 339.12 cm²

3 0

2 years ago

Is 5x-7y=3 standard form?

barxatty [35]

Yes it is. Ax+By=C is standard form. :)

7 0

3 years ago

During a big race, Jeff races his car at a rate of 125 miles per hour for 3.2 hours. What is the distance of the race?

olga nikolaevna [1]

Answer:

unoriginal presidential play insisting that the president is a little more aggressive and more aggressive 6PM to the

7 0

2 years ago

Read 2 more answers

Which costs more per gallon? 5 gallons for $12.50 or 11 gallons for $26.40

Effectus [21]

Answer: 5

Step-by-step explanation:

If;

5 gallons = $12.50 / 5 = $2.50/gallon

11 gallons = $26.40 / 11 = $2.40/gallon

In conclusion, 5 gallons cost more per gallon than 11.

6 0

3 years ago

Divide. express your answer in simplest form.<br><br>3 5/6 ÷ 3 3/4

Harlamova29_29 [7]

Answer:

$\frac{46}{45}$

Step-by-step explanation:

3 5/6 ÷ 3 3/4 = 46/45

3 0

2 years ago