exam Maths Puzzle Numerical Ability

The combined resistance of two resistors R1 and R2 in parallel circuit is given by the formula. Simplify the formula
Rt= 1
------------
1/R1 + 1/R2

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exam Other Question

Can someone help me solve this problem?

8x -11 = 2x + 1

Thanks, Lisa
solve for y:
3ysquared -2[y-(3-2y)]=3(y-2)squared - 12

(I can't make a squared sign so I just typed it in as words)