The average of 3 numbers is 7. two of the numbers are 8 and 9. what is the third?
2 answers:
Make an equation. x will be the third number.
To find the average, you add up the numbers then divide the sum by the number of numbers you added up.
(8 + 9 + x) ÷ 3 = 7
Now solve. Add up like terms (8 + 9).
(17 + x) ÷ 3 = 7
Multiply both sides by 3.
17 + x = 21
Subtract both sides by 17.
x = 4
The third number is 4.
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Answer:
i think it's...2
Step-by-step explanation:
Answer:
35
Step-by-step explanation:
There are 3 angles in a triangle
∠1 , ∠2 , ∠3
Of which
∠1 = ∠2
∠3 = 110
By angle sum property
∠1 + ∠2 + ∠3 = 180
∠1 + ∠2 = 180-110
∠1 + ∠2 = 70
∠1 = 70 ÷ 2
=35
∠1 = ∠2 = 35
Hence , 35+35+110 = 180
Answer:
n = -2
Step-by-step explanation:
Step 1: Write equation
3 = -1.5n
Step 2: Divide both sides by -1.5
n = -2
Step 3: Check
<em>Plug in x to verify it's a solution.</em>
3 = -1.5(-2)
3 = 3
Answer:
Step-by-step explanation:
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it's a it's the first one
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