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What is 3 whole minus 45?

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3 - 45 = -42
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What is -2 wholes 3 over 4 minus 1 over 4?

-2 3/4 - 1/4 = -(2 3/4 + 1/4) = -[2 (3+1)/4] = -(2 4/4) = -(2 + 1) = -3 or -2 3/4 - 1/4 = - (4*2 + 3)/4 - 1/4 = -11/4 - 1/4 = (-11 - 1)/4 = -12/4 = -3

What is 3 square root of 45 minus 3 square root of 5?

3*sqrt(45) - 3*sqrt(5) =3*sqrt(9*5) - 3*sqrt(5) = 3*sqrt(9)*sqrt(5) - 3*sqrt(5) = 3*3*sqrt(5) - 3*sqrt(5) (taking the principal root) = 9*sqrt(5) - 3*sqrt(5) = 6*sqrt(5)