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vovikov84 [41]
3 years ago
14

A plumber charges a $75 flat fee for jobs lasting up to an hour and $30 for each hour of labor after the first hour. which expre

ssion models the cost of a job lasting h hours, when h is greater than 1?
Mathematics
2 answers:
larisa [96]3 years ago
6 0

Answer:

75+30h

Step-by-step explanation:

professor190 [17]3 years ago
4 0

Answer:

75+30h

Step-by-step explanation:

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2 years ago
A train leaves San Diego at 1:00 pm. A second train leaves the same city in the same direction at 3:00 pm. The second train trav
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Answer:

The speed of the first train is 45 mph and the speed of the second train is 75 mph

Step-by-step explanation:

Let x represent the speed of the first train in mph. Since the second train, is 30 mph faster then the first, therefore the speed of the second train is (x + 30).

The first train leaves at 1:00 pm, therefore at 6:00 pm, the time taken is 5 hours. Therefore the distance covered by the first train at 6:00 pm = x mph * 5 hours = 5x miles

The second train leaves at 3:00 pm, therefore at 6:00 pm, the time taken is 3 hours. Therefore the distance covered by the second train at 6:00 pm = (x + 30) mph * 3 hours = (3x + 90) miles

Since the second train overtakes the first at 6:00 pm, hence:

3x + 90 = 5x

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x = 45

Therefore the speed of the first train is 45 mph and the speed of the second train is 75 mph (45 mph + 30 mph).

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2 years ago
HELP PLEASE 26 POINTS!! please provide an explanation tooo!!!!
Mars2501 [29]

Answer:

B

Step-by-step explanation:

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8 0
2 years ago
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The ratio of girls to boys in the grade is 9 to 10. If there are 225 girls, how many boys are there?
MArishka [77]

Answer:

250 boys

Step-by-step explanation:

We know that the ratio is 9:10 from girls to boys

Take 225 and divide it by 9

225 ÷ 9 = 25

So we know that 25 is a factor of 225

We can the number of boys and multiply it by 25 to get 250

If we put it in the ratio form:

225:250 = 9/10

Check work:

25 x 9 = 225

25 x 10 = 250

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