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3 years ago

-1/6 + ( -3/7) = A. -25/42 B. -4/13 C. 11/42 D. 2/13

Mathematics

2 answers:

alekssr [168]3 years ago

6 0

Answer: the anwser is A

Step-by-step explanation:

I used a calculator lol

spin [16.1K]3 years ago

3 0

Answer:

C: 11/42

Step-by-step explanation:

-1/6 + (-3/7)

This can also be written as -1/6 + 3/7

Find the LCD: 42

Divide 42 by the original denominators: 42 / 6 = 7. 42 / 7 = 6

Multiply the numerators by the quotient: -1 x 7 = -7. 3 x 6 = 18

New equation: -7/42 + 18/42

Focus on the numerators: -7 + 18 = 11

Put it all together: 11/42

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Find the duration
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Time : 9:00am to 10:15am
Duration: 1hour 15 mins or 1.25hours

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Find difference in distance travelled between the two cyclists.
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Difference in speed = 6km/h
1 hour = 6 km
1.25 hours = 7.5km

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Find the distance the cyclist traveled
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42.5 - 7.5 = 35km
35km ÷ 2 = 17.5km

The slower cyclist traveled 17.5 km in the 1.25 hours

17.5 + 7.5 = 25 km

The faster cyclist traveled 25km in the 1.25 hours

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Find the speed of the slower cyclist
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The cyclist was traveling at 14km/h

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Find the speed of the faster cyclist
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1.25 hour = 25km
1 hour = 25 ÷ 1.25
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The cyclist was traveling at 20km/hour

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Answer: The speed were 14km/h and 20 km/h
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3 years ago

Read 2 more answers