Question

What is -10 (b-9) please​

Answer 1

-10(b - 9) distribute by multiply -10 × b = -10b and -10 × -9 = 90

-10b + 90, final answer

Answer 2

Multiply -10 and b, and -10 and -9.

A negative and a positive equal a negative, but a negative and a negative equal a positive.

-10b+90

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hope it helps