book Maths Puzzle Numerical Ability

Evaluation the expression for the given value of the variable:

1. 8a when a=4

2. c+15 when c=12.5

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book Other Question

how do you find the area of a rectangle on a coordinate plane? A Traingle has sides 3x + 7 , 4x - 9, and 5x + 6. Find the expression that represents its perimeter.