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qwelly [4]
3 years ago
10

Please help me for the brainliest answer

Mathematics
1 answer:
Zinaida [17]3 years ago
3 0

Answer:

5n^2

Step-by-step explanation:

This is a quadratic sequence.

The nth term must have n^2.

The sequence has a factor of 5.

5n^2

5(1)^2=5\\5(2)^2=20\\5(3)^2=45\\5(4)^2=80\\5(5)^2=125

Few terms to this sequence are:

5, 20, 45, 80, 125, 180, 245, 320, 405, 500, 605, 720, 845, 980, 1125, 1280, 1445, 1620, 1805, 2000, 2205, 2420, 2645, 2880, 3125, 3380, 3645, 3920, 4205, 4500, 4805, 5120, 5445, 5780, ...

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Sam scored 43, 48, and 42 points on three tests. How many points should he get on the fourth test to get an average score of 50?
tatiyna

So we know that an average is the sum of the scores divided by the number of scores that were added together. In this case we are going to be dealing with 4 tests. So let's say x is the score for our fourth test. We can create this equation:

\frac{x+43+48+42}{4}=50

So then we need to simplify the top:

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Then multiply by 4 on both sides to get rid of the denominator:

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Then solve for x:

x=67

So now we know that Sam needs to score a 67 on the fourth test to have an average score of 50.

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