exam Maths Puzzle Numerical Ability

If f(x)=5x-1 find the following;
f(a-2)
McGraw Hill 6th edtion,chapter 7.5,exercise # 36
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exam Other Question

a box of apples weighs 42 pounds, plus or minus 1/2 pound. write an absolute value inequality expressing this fact. let w equal the weight of a box of apples. Rewrite the middle term as the sum of two terms and then factor by grouping
x^2+4x-21

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