7-8 - Yes or No? If No, give a reason. 7. (a) Is the expression () equal to ? (b) Is there a difference between (-5)* and -5*? 8. (a) Is the expression (x*)* equal tox*? (b) Is the expression (2x*)' equal to 2r? (c) Is the expression V4a' equal to 2a? (d) Is the expression Va + 4 equal to a + 2?

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A: Express the sum of x and y reduced by c as an algebraic expression.

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