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valkas [14]
3 years ago
15

Which of the following solutions solves the system?

Mathematics
2 answers:
katen-ka-za [31]3 years ago
8 0
The answer is C

(1,-1)
Leona [35]3 years ago
6 0
(1,-1) is what I think the answer is
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George and Paul use a metal alloy that is 18.1% copper to make jewelry. How many ounces of an alloy that is 14% copper must be m
ella [17]

Answer:

Use 49 ounces of the 14% allow and 41 ounces of the 23% alloy.

Step-by-step explanation:

Each ounce of the 14% copper contains 0.14 ounce of pure copper.

Each ounce of the 23% copper contains 0.23 ounce of pure copper.

Each ounce of the 18.1% copper contains 0.181 ounce of pure copper.

Use x ounces of the 14% and y ounces of the 23% to make 90 ounces of 18.1% alloy.

x+y  = 90

y = 90-x

0.14x + 0.23y = 0.181·90

0.14x + 0.23(90-x) = 16.29

0.14x + 20.7 - 0.23x = 16.29

-0.09x + 20.7 = 16.29

4.41 = 0.09x

x = 49

y = 90-x = 41

Use 49 ounces of the 14% allow and 41 ounces of the 23% alloy.

7 0
3 years ago
PLEASE HELPP Btw letter D. Says 80
n200080 [17]
C
the explanation is in the photo

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2 years ago
Find two matrices A and B such that 2A-3B= [5 0
amm1812

The easy answer: If, say, B is the zero matrix, i.e.

B=\begin{bmatrix}0&0\\0&0\end{bmatrix}

then

2A=\begin{bmatrix}5&0\\-1&2\end{bmatrix}\implies A=\begin{bmatrix}\dfrac52&0\\\\-\dfrac12&1\end{bmatrix}

3 0
3 years ago
What are the intercepts of the equation 18x-9y+3z=18
IceJOKER [234]
The answer is:  [D]:  " <span>(1, 0, 0), (0, –2, 0), (0, 0, 6) " .
______________________________________________________</span>
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Round to the nearest place value and write in scientific notation 1,402,941,487
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Step-by-step explanation:

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