22/25 is 88/100 in simplest form
I take it that only 7 stamps are misplaced and that we are asked for the total value of the stamps including those which have been misplaced.
If each is worth $0.15 then, the total worth of 7 stamps is $1.05. Then, we add this value to the value of his remaining stamps, $5.55, the answer would be $6.60.
The function represents the number of accidents (f(x)) per 50 million miles driven as a function of the driver's age (x).

f(45) indicates that you have to find the value of f(x) when x=45, to do so replace the equation of the function with the value of x and solve for f(x)

For x=45 years f(x)=190
f(45)=190; This value indicates that 45-year-old drivers had 190 accidents per 50 million miles driven.
For number 9 the answer is B
Area of triangle = (1/2)*b*h = (1/2)*7*10
= 7*5 = 35 squared cm