exam Maths Puzzle Numerical Ability

simplify:(-7)(-3)+(-2)^2+(-16)(2)

14x(-3y)-(-3)(-5y)

4[3x+(-2x)]-5(3x+2x)

(70a-40b)/(-10)

-3(x-5)-(x+7)

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Part of $13,750 is invested at 9% interest and the rest is invested at 8%. After on year, the accounts paid $1,185 in interest. How much was invested at the lower rate? find the slope of the line that is perpendicular to the one represented by the given equation The problem I have is l has y-intercept(0,3) and is parallel to the line with equatio