X2 + 18 = 67
whats the answer?

7

Step-by-step explanation:

+ 18 = 67

You first need to subtract 18 from both sides:

+ 18 = 67

    - 18    -18

_________

= 49

To get rid of the square, you need to square root both sides:

= 49

This leaves you with:

x = 7

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)