3 years ago

Which of the four representations are incorrect?

Mathematics

2 answers:

MrMuchimi3 years ago

7 0

The second one is incorrect

Ulleksa [173]3 years ago

4 0

Answer:

second one

Step-by-step explanation:

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Which of the following ordered pairs represents the solution to the system given below? 2x + y = 20 4x − 2y = 40 A) (10,0) B) (0

shtirl [24]

$2x+y=20 \ \ \ |\times 2 \\
4x-2y=40 \\ \\
4x+2y=40 \\
\underline{4x-2y=40} \\
4x+4x=40+40 \\
8x=80 \ \ \ |\div 8 \\
x=10 \\ \\
2x+y=20 \\
2 \times 10+y=20 \\
20+y=20 \ \ \ |-20 \\
y=0 \\ \\
\boxed{(x,y)=(10,0)} \Leftarrow \hbox{answer A}$

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If g(x) = 2(x − 4), find the value of x if g(x) = 20. 32 12

nlexa [21]

Answer:

The value of x is $14$

Step-by-step explanation:

we have

$g(x)=2(x-4)$ ------> equation A

In this problem we have

$g(x)=20$

Substitute the value of g(x) in the equation A and solve for x

$20=2(x-4)$

Divide by $2$ both sides

$20/2=2(x-4)/2$

$10=(x-4)$

Adds $4$ both sides

$10+4=(x-4)+4$

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KIM [24]

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Can some help me with number 2?

andrezito [222]

Answer:

$54.85

Step-by-step explanation:

Total=$42.85

Total + Tax(8%)=$46.28

Total + Tax(8%) + Tip(20%)=$54.85

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Answer:

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Step-by-step explanation:

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