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skad [1K]
3 years ago
8

Solve the systemSolve the system by either substitution or elimination 4x + 4y = 20, 2x -2y = -18 by either substitution or elim

ination
Mathematics
1 answer:
valina [46]3 years ago
7 0
{4x + 4y = 20  | ÷4<span>
{2x -2y = -18   | </span>÷2

{x + y = 5 
{x -y = -9
--------------
2x = -4
x = -2

x + y = 5 
-2 + y = 5
y = 5 + 2
y = 7

The answer is (-2, 7)

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marta [7]

x = 3/32

Option C is the right answer

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2 years ago
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Nata [24]

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8 0
3 years ago
Simplify the expression 224,000 X 0.00021 using scientific notation and express your answer in scientific notation.
Marizza181 [45]

Answer:4.704×10^1

Step-by-step explanation:

To simplify 224000×0.00021 in scientific notation

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4 0
3 years ago
Select the exclusion that fits best with this problem.<br><br><br><br> 13x^6/51x^4
Damm [24]

ANSWER

x \ne0

EXPLANATION

The given problem is

\frac{13 {x}^{6} }{ 51 {x}^{4}  }

This is defined if and only if

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Even the given expression can be simplified to obtain:

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5 0
2 years ago
steve has quiz scores of 60,64,75,71. If all the quizzes count the same, what is the lowest grade he can make on the next quiz t
NeX [460]

Answer:

The last quiz score must be at least an 80 to get the average to be a 70.

Step-by-step explanation:

In order to find this, you need to take the average of the 4 test scores along with the unknown test score (x). So, to find an average, we add all the numbers together and divide by the amount of tests taken. We can then set this equal to 70 since that is the minimum average.

(60 + 64 + 75 + 71 + x)/5 = 70 ------> Multiply both sides by 5

(60 + 64 + 75 + 71 + x) = 350 -----> Combine like terms

270 + x = 350 -----> Subtract 270 from both sides

x = 80

7 0
3 years ago
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