sallonquarts
08.10.2021 •
Mathematics
Multiply.
−3⋅7
−21
−11
11
21
Solved
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Ответ:
-21
Step-by-step explanation:
Since one number is negative and the other is positive, the product is negative and just multiply normally.
Ответ:
-21 should be correct
Step-by-step explanation:
Please mark me as brainliest :D
Ответ:
time = x hr/job ; rate = 1/x job/jhr
Slower maid DATA:
time = 3x hr/job ; rate = 1/3x job/hr
Together DATA:
time = 3 hr/job ; rate = 1/3 job/hr
Equation:
rate + rate = together rate
1/x + 1/3x = 1/3
Multiply thru by 3x to get:
3 + 1 = x
x = 4 hrs (time for the faster maid to do the job)