WHAT IS THE RADIUS OF T JUST CHECKING ANSWERS, I will mark brainliest

Find the total area for the regular pyramid ( follow the answer set up in the picture)

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

If (x + 8) is a factor of f(x), which of the following must be true? both x = –8 and x = 8 are roots of f(x). neither x = –8 nor x = 8 is a root of f(x). f(–8) = 0 f(8) = 0