exam Maths Puzzle Numerical Ability

I need help with this problem please
factor each expression
y2-81

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exam Other Question

how do you find the y-intercept to an equation like this y=3/5x-4

I need help simplifying and solving the following equation for H:

A= 1/2h(a+b).

I got to 2A=ha + hb. Is this right? How do I solve for H from here?