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Answer:
21
Explanation:
When you plug the values in the expression becomes 45 - 4(6). Following the order of operations multiply 4(6) first. Now the equation is 45 - 24. Subtract these numbers to get 21.
Given
b - 4a ← substitute a = 6 and b = 45 into the expression
45 - 4(6) = 45 - 24 = 21