exam Maths Puzzle Numerical Ability

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'?

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exam Other Question

Can someone help me with this problem?

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

f(-1)

Thanks,
Ashley
(4 / x^6) ^3 I need to simplify it and I am pulling my hair out. Maybe I am too old for this! Can you possibly show me a detailed explanation?