exam Maths Puzzle Numerical Ability

HG and EF are bases, HI-height,

If HG=14, HI=2x+2, EF=4x+4, area=170, find x, HI, and EF.

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exam Other Question

Find the sum of the infinite geometric series:
1 + 1/5 + 1/25 + 1/125....
I keep coming up with 1/5.
Any help would be appreciated Please help me to solve my homework question. thanks!

Write in lowest terms

25x^2-16/15X^3+7x^2-4x