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Blizzard [7]
3 years ago
11

Average after 8 test is 91%. if he gets a 78% on his 9th test what will be the new acerage

Mathematics
1 answer:
Vika [28.1K]3 years ago
6 0
All you need to do is add te averages together then divide them by 2. 91%+78%=169% 169%÷2=84.5% So the new test average is 84.5%
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If we are solving for x it has<u> two answers</u> <u>   15,-1</u>

EXPLANATION:

first i take the root of both sides and then solve from there :

Step 1: Simplify both sides of the equation.

x2−14x+22=37

Step 2: Subtract 37 from both sides.

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Step 3: Factor left side of equation.

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Step 4: Set factors equal to 0.

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HOPE THIS HELPS

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<h2>3/5</h2><h2>Step-by-step explanation:</h2>

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