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icang [17]
4 years ago
7

Frances can complete 91 oil changes in seven days how many oil changes can Frances complete and 11 days

Mathematics
1 answer:
Mama L [17]4 years ago
3 0

Answer:

143

Step-by-step explanation:

divide 91 by seven. this will tell you how many oil changes happened in one day . ( answered 13) once you know that just times your answer by 11

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Use the left and right triangles. (the two smaller ones -- ACD and BCD)
By similar triangles ACD is similar to BCD
on the left AD/CD is one ratio
On the right CD/DB is the other. These two ratios are equal because they are corresponding parts.

AD / CD = CD / DB
AD = 3
DB = 12
CD = ??
Substitute.
3/CD = CD/12 Cross multiply
36 = CD^2
sqrt(36) = sqrt(CD^2)
CD = 6 <<<<==== Answer.
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Answer:

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Step-by-step explanation:

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