I need help with this, pls, thx

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?

Solve the following inequalities and show the solution on a number line. 2x+3< 3(4x+5)

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