12. The radius, r, of a stainless steel ball can be modeled by r = 0.31 km, where m is the mass of the ball and ris the radius in inches. Use this equation to find the mass when the radius equals 1.55 inches. (You must show work
to receive credit.) (pts each)

Timed*** there are 8 rows and 8 columns, or 64 squares on a chessboard. suppose you place 1 penny on row 1 column a, 2 pennies on row 1 column b, 4 pennies on row 1 column c, and so on … how many pennies are on each square? a =   b =   c = d =   e =   f = g =   h =

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?