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madam [21]
2 years ago
8

Three of four numbers have a sum of 22. If the average of the four numbers is 8, what is the fourth number ?

Mathematics
1 answer:
KatRina [158]2 years ago
3 0
X+y+z=22

(x+y+z+t)/4=8
subsitute
x+y+z=22
(22+t)/4=8
multiplly by 4
22+t=32
subtract 22
t=10

the fourth number is 10
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Step-by-step explanation:

Given

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ivolga24 [154]

Answer:

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Step-by-step explanation:

Given that,

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The width of the metal box be =(10-2x) inches

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x=\frac{-(-100)\pm\sqrt{(-100)^2-4.12.15}}{2.12}

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Next, we take the linear coeffeicent and divide it by 2 then square it.

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This is called a perfect square trinomial.

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± menas that we have a positive and negative solution.

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2 years ago
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lyudmila [28]

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