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Oksi-84 [34.3K]
3 years ago
5

If a^2+3a+9=0, What is a^3?

Mathematics
1 answer:
kifflom [539]3 years ago
7 0

i dunooo i dont even nooooo

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Can you explain step by step for #15 and #16 I have a test on this tomorrow
RUDIKE [14]

Answer:

15.

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

16. 10 ml of 20% saline and 40 ml of 10% saline

Step-by-step explanation:

A chemist takes x ml of 20% saline and y ml of 10% saline. In total, he takes

x + y ml that is 50 ml, so

x + y = 50.

There are  0.2x ml of salt in x ml of 20% saline and 0.1y ml of salt in 10% saline. There are 0.12\cdot 50=6 ml of salt in 50 ml of 12% saline. Thus,

0.2x+0.1y=6

15. We get the system of two equations:

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

16. Solve this system. From the first equation:

x=50-y

Substitute it into the second equation:

0.2(50-y)+0.1y=6\\ \\10-0.2y+0.1y=6\\ \\-0.1y=6-10\\ \\-0.1y=-4\\ \\y=40\\ \\x=50-y=50-40=10

7 0
2 years ago
Jenna uses 6.1 pints of white paint and blue paint to paint her bedroom walls. 4/5 of this amount is white paint, and the rest i
Novay_Z [31]

Answer:

2.44 pints of white

Step-by-step explanation:

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3 years ago
A craft show has an admission fee of $1.50 for children and $4.00 for adults. On Saturday 155 people came to the carnival and $5
rjkz [21]
X+y=155. Y= -x+155

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1.50x-4x+620=520
-2.5x =-100
X= 40. Y=110
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3 years ago
What is the formula for the accounting equation
ohaa [14]

Answer:

A = L + E

Step-by-step explanation:

A = Assets

L = Liabilities

E = Equity

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2 years ago
What are the five factors of 16?
liberstina [14]
1 2 4 8 and 16 are the factors

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3 years ago
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