-2(x - 5) + 4(9 + x)
-2x + 10 + 36 + 4x
=2x + 46
Percent error is calculated using
((Actual - predicted) / actual) * 100
In this case, the actual value of the number of pages he read is 20. The expected value was 23. So simply plug in:
((20 - 23) / 20) * 100 = -15%
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14 hits
8 divided by 2 = 4 hits
So
28 divides by 2 = 14
