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Mamont248 [21]
3 years ago
14

Find the measure , I need help

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

7x+40-180=3x+112-180

7x-3x=112-40

4x=72

x=18

A=7*18+40=126

B=21+112=133

ehidna [41]3 years ago
7 0

Answer:

166°

Step-by-step explanation:

Since ∠A = ∠B,

the equation below helps to find the value of x and angle A:

  • 7x + 40° = 3x + 112°
  • 7x - 3x = 112° - 40°
  • 4x = 72°
  • x = 72°/4
  • x = 18°
  • ∠A = 7*18° + 40° = 166°
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An old railroad car was able to haul one days worth of coal in 15 hours the new railroad car only takes 10 hours because of high
masha68 [24]

Step-by-step explanation:

Old Railroad Car:

  • 1 day of coal in 15 hours
  • 1/15 days of coal in 1 hour

New Railroad Car:

  • 1 day of coal in 10 hours
  • 1/10 days of coal in 1 hour

Total number of days of coal in 1 hour

= 1/15 + 1/10 = 1/6.

Since there is 1/6 days of coal in 1 hour,

there will be 1 day of coal in 6 hours.

It will take them 6 hours to transport the supply.

3 0
3 years ago
40% of an hour in minutes and secs
olga55 [171]

Answer:

<em>40% of an hour </em><em>equals: </em><em>24 minutes </em>

<em>40% of an hour also </em><em>equals: </em><em>1440 seconds</em>

<u>Skills needed: Time Units Conversion</u>

Step-by-step explanation:

1) First, we need to understand how to convert between hours, minutes, and seconds.

There are 60 minutes in 1 hour ==> 1 hour = 60 minutes

There are 60 seconds in 1 minute ==> 1 minute = 60 seconds

- This means that there are 3600 seconds in 1 hour (60*60=3600)

- This also means that there are 60 minutes in 1 hour

2) We are trying to find how many minutes (or seconds) 40% of an hour is.

---> When converted to decimal, 40\%=\frac{40}{100}=0.4

40% of an hour = 0.4 hours

Since there are 60 minutes in an hour, there are 60*0.4 minutes in 0.4 hours. 60*0.4=24 so, 24 minutes in 0.4 hours.

Since there are 3600 seconds in an hour, there are 3600*0.4 seconds in 0.4 hours. 3600*0.4=1440 so, 1440 seconds in 0.4 hours.

3 0
2 years ago
Read 2 more answers
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Fantom [35]
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4 years ago
Factor each expression 9+15m-21n
Marianna [84]

Answer:

The answer is 3(3+5m-7n)

Hoped this helped!

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3 years ago
Factor the coefficient out of 1/5x -3/5
zysi [14]

Answer:

1/5 (x-3)

Step-by-step explanation:

1/5x -3/5

1/5 (x-3)

6 0
3 years ago
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