book Maths Puzzle Numerical Ability

I have a right triangle I have to find the area for

On the figure they have points a b c
A to C 6ft C to B is 9ft and I must need A-B
the right triangle does show a 90 degree at point C

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im really having a hard time with this...any help would be appreciated.

Find an equation for the line that passes through (1,-4) and has slope -3/4 The question in my homework is: Show that if k is a natural number, then i^4k+1 = i always

I have found the pattern that every other odd number starting at i^5 is equal to i. I