exam Maths Puzzle Numerical Ability

If a roof is 7m from peak to eave the attic space is 3m high at the peak, how long does each of the pieces of insulation need to be? Round to the nearest tenth.

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Hi, Can I have some help with this function?

Use f(x) = 2x - 8 and g(x) = 5x - 2 to evaluate the expression.
(a) f(g(-7))

(b) g(f(-7)) find 4 rational numbers such that the product of the 1st 2nd and 3rd is 54. The 2nd number is 2 less than the 1st number, the 3rd number is 5 less than the 2nd number and the 4th number is 3 less than the 3rd number