exam Maths Puzzle Numerical Ability

Can someone help me with this problem?

If f(x) = 4x - 3, I need to find the following:

f(-1)

Thanks,
Ashley

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exam Other Question

Dad is 4 times as old as his son Jim. In ten years, Dads age will be twenty years more than twice Jims age. Find thier age now?

thank you I need to check this answer...In a parallelogram, the ratio of a side to its altitude is 2:1. If the Area is 800sq', find the altitude. Would it be 20'?