PLEASE HELP WITH THESE TWO f(x) = x-5
g(x) = 2x+4
find (g*f)(6)

f(x) = x^2
g(x) = 4x+2
find (f*g)(0)

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Mikes car gets an average of 28 mpg. there are 12 gallons of fuel in mikes car when he starts his trip of 140 miles. about how many gallons are left at the end of his trip?

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?