Abram rode in a cab for 9 miles. the taxi driver charged $2.50 for the first 1/2 mile and $1.25 for each additional 1/2 mile. how much did abram pay for the cab ride in all?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?