2 years ago

What is the value of the expression?

1 answer:

6 0

-2/5 - (3/7) × (7/10)
= -2/5 - (21/70)
= -2/5 - 3/10
= -4/10 - (3/10)
= -7/10

Or

-0.7 (Decimal Form)

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Answer:

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It takes "x" hours for Dorsey

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Rate is inverse of time, so rates are:

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We know Rate * Time = Work

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$(\frac{1}{x}+\frac{1}{5x})4=1\\(\frac{1}{x}+\frac{1}{5x})=\frac{1}{4}\\\frac{5+1}{5x}=\frac{1}{4}\\\frac{6}{5x}=\frac{1}{4}\\5x=24\\x=4.8$

Dorsey takes 4.8 hours alone

Campbell takes 4.8 * 5 = 24 hours alone

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