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Lubov Fominskaja [6]
3 years ago
7

Sam scored 59, 64, and 68 on three tests. How many points should he get on the fourth test to get an average score of 70? A. 63.

67 points
B.65.25 points
C.75 points
D.89 points
Mathematics
2 answers:
olga2289 [7]3 years ago
6 0
To find this out the easy way, add up all the numbers and an answer, then divide by 4.
59 + 64 + 68 + 63.67 = 254.67
254.67/4 = 63.66
A is not correct.
59 + 64 + 68 + 65.25 = 256.25
256.25/4 = 69.25
B is not quite correct.
59 + 64 + 68 + 75 = 266.
266/4 = 66.5
C is not correct.
59 + 64 + 68 + 89 = 280
280/4 = 70.
D.) is the correct answer.
I hope this helps!
tatyana61 [14]3 years ago
6 0

Answer:

<h2>its D </h2><h2>i got it right on my test ;)))</h2>

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For this case we have that by definition, the equation of the line in the slope-intersection form is given by:

y=mx+b

Where:

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We have the following points through which the line passes:

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We find the slope of the line:

m = \frac {y_ {2} -y_ {1}} {x_ {2} -x_ {1}} = \frac {5-13} {7900-6} = \frac {-8} {7894} = - \frac {4} {3947}

Thus, the equation of the line is of the form:

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We substitute one of the points and find b:

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Finally, the equation is:

y = - \frac {4} {3947} x + \frac {51335} {3947}

Answer:

y = - \frac {4} {3947} x + \frac {51335} {3947}

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