3 years ago

1. Find A) 35 B) 47.5 C) 67.5 D95

Mathematics

1 answer:

BARSIC [14]3 years ago

4 0

Answer:

find which one my guy im trying to get infinite awnseres srryyyyy

Step-by-step explanation:

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3 years ago

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alukav5142 [94]

Answer: There are 4 students in the group.

Step-by-step explanation:

Let the number of students in the group be n

If one of them scored 9 more points , their average score would be 81 points.

So, our equation (1) will be

$\frac{\sum x+9}{n}=81\\\\\sum x+9=81n$

Similarly,

If one of them scored 3 points less, their average score would be 78 points.

So, our equation (2) will be

$\frac{\sum x-3}{n}=78\\\\\sum x-3=78n$

So, from equation (1) and (2) we get:

$81n-9=\sum x=78n+3\\\\81n-9=78n+3\\\\81n-78n=3+9\\\\3n=12\\\\n=\frac{12}{3}\\\\n=4$

Hence, there are 4 students in the group.

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3 years ago

The area enclosed by a circle is 25 pi square inches. what is the length, in inches, of the radius of the circle?

lyudmila [28]

Area of the circle=πr²

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r= 5 inch

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Step-by-step explanation:

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