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olya-2409 [2.1K]
3 years ago
12

Which of these expression is equivalent to -2(3-y)​

Mathematics
2 answers:
Alisiya [41]3 years ago
8 0

A. -6+2y

Step-by-step explanation:

-2×3-2×(-y)

multiply the numbers

-6-2×(-y)

multiplying two negatives equals a positive

-6+2y

velikii [3]3 years ago
8 0

Answer:

a

Step-by-step explanation:

-2×3=-6 -2×-y=2y so you awnser us -6+2y

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Two mechanics worked on a car. The first mechanic worked for 10 hours, and the second mechanic worked for 15. Together they char
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Answer: Hourly rate for first mechanic:  $65

Hourly rate for second mechanic: $70

Step-by-step explanation:

Let x be the hourly rate for first mechanic and y be the hourly rate for second mechanic.

The first mechanic worked for 10 hours, and the second mechanic worked for 15.

So first mechanic will charge for 10 hours = 10x

Second  mechanic will charge for 15 hours =15x

Together they charged a total of $1700.

i.e. 10x+15y=1700--------------(1)

Sum of the two rates was $135 per hour

x+y=135 ---------------(2)

Multiply the equation (2) by 10 on both sides , we get

10x+10y=1350   --------------(3)

Eliminate equation(3) from (1) , we get

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Put value of y in (2) , we get

x+70=135\\\Rightarrow\ x=135-70=65

Hence, the hourly rate for first mechanic is $65 and the hourly rate for first mechanic is $ 70.

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Step-by-step explanation:

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