exam Maths Puzzle Numerical Ability

simplify (3x-1y-2)

the -1 and -2 are exponents i just dont know how to type them in please help

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exam Other Question

Find the values of X and Y without using the fact those vertical angles are equal in measure. Show work.

(3x+4y)top of X
(x+1)right side of X above the straight line.
How many years does Steven need to invest his $3,000 at 7% to earn $210 in simple interest?