What value of a makes the equation true? 1.7a+0.3a=4/5 1. a=2/5 2. a=2 4/5 3. a= -1 1/5 4. a= 1 3/5

What are the domain and range of the function? f(x) = -4 (sqrt)x

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

(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