The half-life of radium is 1690 years. If 40 grams are present now, how much will be present in 980 years?

Measure of angles 31 (x+4) (3x+9) me

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?