exam Maths Puzzle Numerical Ability

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...
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exam Other Question

Alice made a $3,000 down payment on a new Ford Explorer Wagon. She still owes 90% of the selling price. What was the selling price of the wagon? 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