Answer:
a ≈ 8.9
Step-by-step explanation:
Set up the equation as so:
8a^2 + 2 = 634
First, subtract two from both sides:
8a^2 = 632
Then, divide by 8 to further isolate the variable.
a^2 = 79
To get rid of the squared, you have to take the square root of both sides. The square root of 79 is roughly 8.9. Ergo, a ≈ 8.9
the sun is one hundred and fifty million kilometers away from the earth write this as an ordinary whole number
i is defined as the square root of -1 or 
So the formula of the volume of a sphere is

Just plug in 2 in the r variable and solve:

Your volume is 33.49 cm^3