2 years ago

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:

lesantik [10]2 years ago

6 0

The number is 15 wnwnjw

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Emily has pennies and five dollar bills in her pocket. The number of pennies is eight less than three times the number of five d

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Answer:

3f - 8 = number of pennies

Step-by-step explanation:

3f - 8 = number of pennies

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2 years ago

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Plzz give explanation!!!!! PLZZZ I NEED HELP

OlgaM077 [116]

I think it’s 36, Are there options??

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What are reasons A and B in the proof?

Tcecarenko [31]

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2 years ago

Your assigned 32 math exercises for homework you complete 87.5of these before dinner how many do you hav to do after dinner.

krek1111 [17]

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2 years ago

Use the discriminant to find the number and type of solution for x^2+6x=-9

likoan [24]

Answer:

D = 0; one real root

Step-by-step explanation:

Discriminant Formula:

$\displaystyle \large{D = {b}^{2} - 4ac}$

First, arrange the expression or equation in ax^2+bx+c = 0.

$\displaystyle \large{ {x}^{2} + 6x = - 9}$

Add both sides by 9.

$\displaystyle \large{ {x}^{2} + 6x + 9 = - 9 + 9} \\ \displaystyle \large{ {x}^{2} + 6x + 9 = 0}$

Compare the coefficients so we can substitute in the formula.

$\displaystyle \large{a {x}^{2} + bx + c = {x}^{2} + 6x + 9 }$

a = 1
b = 6
c = 9

Substitute a = 1, b = 6 and c = 9 in the formula.

$\displaystyle \large{D = {6}^{2} - 4(1)(9)} \\ \displaystyle \large{D = 36 - 36} \\ \displaystyle \large{D = 0}$

Since D = 0, the type of solution is one real root.

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2 years ago