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Zielflug [23.3K]
2 years ago
13

To get an A in a course, you must have an average of at least 90% on four tests worth 100 points each. Your scores so far are 85

, 94, and 84. What must you score on the fourth test to get an A in the course?
Mathematics
1 answer:
kondaur [170]2 years ago
6 0

Answer:

A score of 117 is needed, which Is not possible since the test is over 100.

Step-by-step explanation:

The other 3 scores are 85, 94,84 . Let's x be the 4th score he must score.

Therefore ( 85 + 94 + 84 + X)/4 =95

Then 263+X /4 =95

Cross mutiplying 4*95=263+X

Therefore X= 380-263

X= 117 which is not possible since the test score is over 100.

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astraxan [27]
Procedure:

1) Integrate the function, from t =0 to t = 60 minutues to obtain the number of liters pumped out in the entire interval, and

2) Substract the result from the initial content of the tank (1000 liters).

Hands on:

Integral of (6 - 6e^-0.13t) dt  ]from t =0 to t = 60 min =

= 6t + 6 e^-0.13t / 0.13 = 6t + 46.1538 e^-0.13t ] from t =0 to t = 60 min =

6*60 + 46.1538 e^(-0.13*60) - 0 - 46.1538 = 360 + 0.01891 - 46.1538 = 313.865 liters

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Answer: 613.135 liters



 

3 0
3 years ago
It takes 5 minutes for 7 people to drink 25 pints of water.At this rate,how long would it take 15 people to drink 160 pints of w
EastWind [94]

Answer:

14.9 min

Step-by-step explanation:

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1.4*160=t*15

224=t*15/15

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4 0
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Goryan [66]

Answer:

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3 years ago
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hope this helps

8 0
3 years ago
Read 2 more answers
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