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2 years ago

Someone help me plsss

Mathematics

1 answer:

Vesnalui [34]2 years ago

3 0

Answer:

69.5 and 70.5

Step-by-step explanation:

consecutive numbers mean they are one up from the other

- e.g. 2 and 3,

- 15 and 16

if the first one is x, we can write the second consecutive number as x + 1

The info tells us the sum of these two numbers is 140, so we can write an equation and solve for x.

x + (x + 1) = 140

2x + 1 = 140

2x = 139

x = 139/2 = 69.5

(now we find the next number)

69.5 + 1 = 70.5

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Earth's radius is approximately 6400 km. What is the surface area & volume of the earth?

Tamiku [17]

Answer:

$SA=514,457,600\ km^{2}$

$V=1,097,509,546,667\ km^{3}$

Step-by-step explanation:

step 1

Find the surface area

we know that

the surface area of a sphere is equal to

$SA=4\pi r^{2}$

substitute

$SA=4 \pi (6,400)^{2}$

$SA=163,840,000 \pi\ km^{2}$

substitute the approximate value of pi (3.14)

$SA=(3.14) (163,840,000)$

$SA=514,457,600\ km^{2}$

step 2

Find the volume

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$V=(4/3)\pi r^{3}$

substitute

$V=(4/3)(3.14) (6,400)^{3}$

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kozerog [31]

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