exam Maths Puzzle Numerical Ability

I need to simplify this expression, and I have gotten I think 1/2 way, however I am not sure.

SQ RT 63- -2 SQ RT28+ 5 SQ RT7
SQ RT 63- =SQ RT 9x5 = SQ RT 3x5
so,
how do I br

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exam Other Question

PROBLEM:
SOLVE THE INEQUALITY AND WRITE THE SOLUTION IN INTERVAL NOTATION.
2x^2+8x-10>0

****I KNOW HOW TO SOLVE AN INEQUALITY BUT THIS ONE IS A LITTLE HARDER THAN USUAL...
( Peter is growing two strains of yeast in the labratory. Strain A originally had 80 cells and is known to quadruple every 2 hours. Strain B initially had 640 cells and doubles every