Amy would have spent $22.5 on her books (assuming you meant $10 total, not $10 per book)
Answer:
A = bh = (17 km)(11 km) = 187 km^2
When x = 0 y = a(b)^x = a which is the y intercept
so as the y-intercept = 3 a must be = 3.
Answer:
The slope for the line is 2
