book Maths Puzzle Numerical Ability

What is the coefficient, the like term, and the constant of a+2a+3a-4a? I need help now.

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book Other Question

passes through (5,-2) perpendicular to -8x + 9y =-22 The parking lot at George's Grocery is 60ft. long and 40ft. wide. George plans to expand the parking lot by increasing the length and width by the same amount (x).

1.Write an ex