book Maths Puzzle Numerical Ability

A = 1/2h(B+b)

area of a trapezoid

solve for b

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book Other Question

please help me solve this inequality

j - 8 < 4
-
4

( j over 4 -8 < 4) the measure of the angles of a triangle are x+2, x+4, and 2x=10. Find the measure of each angle.