book Maths Puzzle Numerical Ability

x + 3( x + 1 )= 2x

Read Solution (Total 0)

book Other Question

i cannot figure this out, will somebody please show me how to do this...thanks so much!
Find the value of p if the line joining the points (3,-6) and (p,10) is perpendicular to th 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?