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abbie722
20.03.2021 •
Mathematics
Phillip can do 15 math problems in 5 minutes. How long will it take him to do 21 math problems?
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Ответ:
7 minutes
Step-by-step explanation:
Set up a proportion:I hope this helps!
Ответ:
See below.
Step-by-step explanation:
Step 1 6x + 2 = 6 - 3x Distributive property of multiplication over addition
Step 2 2 = 6 - 9x Subtraction property of equality
Step 3 -4 = -9x Subtraction property of equality
Step 4 4/9 = x Division property of equality
Step 5 x = 4/9 Symmetric property of equality