exam Maths Puzzle Numerical Ability

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Write each specification as an absolute value inequality.

-2.5 is less than or equal to "a" is less than or equal to 2.5

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exam Other Question

If f(x)=2x+5 and g(x)=3x2-1 find the value of f(b2) The question is
Slope: 5; y-intercept: (0, -2)
I believe to figure the answer I would use:
y=5x-2
and the coordinants would be
(5,0)
(0,-2)

I am completely confused. Any help you can give would be great