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Natalka [10]
3 years ago
7

How do you solve this?

Mathematics
2 answers:
Afina-wow [57]3 years ago
5 0
C is equal to (30 x t) + 40
C = 30t + 40
we are given that C = 240
280=30t + 40
solve for t
t = 8 hrs
vovangra [49]3 years ago
4 0

a) C = 40 + 30t

b) 280 = 40 + 30t

30t = 240

t = 8

The plumber worked 8 hours

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Zanzabum

My calculator shows that

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Try 1.41 and it should work out, assuming your teacher wants two decimal places.

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2 years ago
Solve the system of equations 2r + 2s = 50 and 2r – s = 17. A. r = 3, s = 11 B. r = 25, s = 33 C. r = 14, s = 11 D. r = –8, s =
scZoUnD [109]

2r = 17 + s = 50 - 2s \\ 3s = 50 - 17 = 33 \\ s = 11 \\  \\2 r = 50 - 2s \\ 2r = 50 - 2 \times 11 = 50 - 22 = 28 \\ r = 14




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