In which step was the first mistake made when solving this equation.

Consider the function represented by the equation 1/2 j + 1/4 k equals 3 which shows the equation written in function notation with j as the independent variable

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)