Please i need answer ASAP find the area of each shapes

Three coins are flipped. what is the probability that there will be at least two tails?

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

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?