You have 704 grams of a radioactive kind of praseodymium. if it's half life is 17 minutes, how much will be left after 69 minutes?

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.

(fog)(x) if f(x)=x^2- 4 and g(x)=x^2 + 2 x, f(g(x))= f(x^2+2x) (x^2+2x)^2-4 (x^2+2x)(x^2+2x)-4 (x^4+2x^3+5x+4x^2)-4 x^4+2x^3+4x^2+5x-4 what am i doing wrong