3 years ago

–40-7+3u simplified expression

Mathematics

1 answer:

svet-max [94.6K]3 years ago

7 0

Answer:

3u-47

Step-by-step explanation:

Just combine like terms, which for this case is the -40 and the -7. Hope this helps!

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Two mechanics worked on a car. The first mechanic charged $65 per hour, and the second mechanic charged $90 per hour. The mechan

Katena32 [7]

Answer:

First mechanic worked 20 hours and second mechanic worked 5 hours

Step-by-step explanation:

Let the number of hours the first mechanic worked = $a$

Let the number of hours the second mechanic worked = $b$

Therefore, we can write 2 equations and then solve them simultaneously:

$a+b=25$

$65a+90b=1750$

Rearranging the first equation: $a=25-b$

and substituting into the second equation to find $b$ :

$65(25-b)+90b=1750$

$1625-65b+90b=1750\\
25b=125\\
b=5$

Now sub $b=5$ into the first equation to find $a$

$a+5=25\\
a=20$

Therefore, first mechanic (a) worked 20 hours and second mechanic (b) worked 5 hours

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To get the result we just have to divide 3.4 liter by 0.4 liter.
3.4:0.4=8.5 - its our result.
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3 years ago

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The school year would be 1981-1982

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Eight more than the product of two and a number x.

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8+2x is the answer. The rest of these characters is for the >20 rule

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