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Evaluate the expression, given x = -2, y = 3, and a = -4.2x – 3y – 4a

Find the product.-7(13)

Simplify by finding the absolute value.

Perform the indicated operations.21 ∙ (-4) + 12 ∙ (-9)

Find the difference.- 4.4 – 10.2

Simplify. 63 ÷ 8 – 5

Find the value of the exponential expression.102

Simplify the expression.-6(-4x + 7) – (7x + 4) – 2x + 11

Use order of operations to simplify the expression.-18 – [(6 – 3) – (-5 – 3)]

Solve the problem.A football team gained 17 yards on one play, lost 19 yards on another, and gained 37 yards on the last play of the first half. They had already gained 293 yards during the half. What was the total yardage gain for the first half?