Someone please do question 7 9 and 10

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265