the answer is x > or equal to 4
C=pi×r2 if there is only the diameter then take half of it
8(3)(4) = 96
96-16(5)= 16
16- 3^2 = 9.
9
he should know how much gallons he need to fill his car up
multiply 1.50 by the amount of gallons he need so he should know how much money to spend on that many gallons
hoped i helped and brainlist plz