exam Maths Puzzle Numerical Ability

I need to set up a 3 by 3 system of linear equation and solve for it on the following word problem.

Kathy has $20,000 to invest. She wants to diversify into three types of inve

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exam Other Question

factorize-
a-12-(root)5x-30x^
b-6(root)7^+x-5(root)7
c-21+20x^+29(root)2x
d-90x^-7(root)6x-2

plz answer these questions....thankyou!!!
1/x-5 - x/x^2-25 <---all over 5/2x

Simplify the complex fraction.