book Maths Puzzle Numerical Ability

Jason got a 7 5 on a math test. He was allowed to go to the math lab and take a retest. He increased his score to 84. What was the percent of increase?

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book Other Question

-7n-10=4 For the expression, the square root of 2x-4
a) If x=8, evaluate the expression and write the result in simple radical form.
b) Evaluate the radical if x is 6.
c) Are both of the