How do i solve 10x to the power of 5 ÷ by 2x to the power of 3

Airline passengers arrive randomly and independently at the passenger-screening facility at a major international airport. the mean arrival rate is 10 passengers per minutes. compute the following probabilities. p(x = 4) p(x > 11)

1foot = 12 inches; 1 yard = 3 feet

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)