Answer:
No, she can't
Explanation:
The equation to solve the problem is the following:
y=0.5x+2.25
where x is the # of miles and y is the amount charged based on the flat rate and the additional $0.50 per mile (x).
y should be less than or equal to 10 since that's the maximum Annie can pay.
y
10
Substitute x with the number of miles asked (18)
y = 0.5(18) + 2.25 = 11.25
Annie would have to spend $11.25 to travel 18 miles, but she can spend at most $10 ⇒ she can't travel 18 miles.