Question

Algebra Question Help Please!

Suppose a white dwarf star has a diameter of approximately 1.2519 × 10^4 km. Use the formula 4πr 2 to find the approximate surface area of the star.

Answer 1

hint: radius = (1/2) * diameter

if diameter = 1.2519 × 10^4 km, then what is the radius?

Answer 2

6259.5

Answer 3

good

now, if surface area = 4 * pi * (radius)^2

what is the surface are?

Answer 4

492,117,633.54 so the answer would be 4.92 * 10^8 km^2 right?

Answer 5

good

Answer 6

thanks!

Answer 7

could you help me with one more real quick? x^12y^-11/x^20y^-13