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quester [9]
3 years ago
13

Solve, using the substitution method.

Mathematics
2 answers:
Phoenix [80]3 years ago
5 0
14-4x=2y
divide both sides by 2
7-2x=y
subsitute 7-2x for y
7-2x+2x=7
add like terms
7=7
true
therefor these 2 equations are the same and there are an infinite number of equations


answer is C
ANEK [815]3 years ago
5 0

y+2x=7

14-4x=2y

Solve 2x+y=7 for y

Add -2x to both sides

2x+y+-2x=7+-2x

y=-2x+7

Substitute -2x+7 for in -4x+14=2y

-4x=14=2y

-4x+14=2(-2x+7)

Simplify both sides of the equation

-4x+14=-4x+14

Add 4x to both sides

-4x+14+4x=-4x+14+4x

14=14

Add -14 to both sides

14+-14=14+-14

0=0

Infinitely many solutions

Answer : C

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If Angel ran a full lap in two minutes, then she ran half of a lap in one minute. If a lap is 2/5 kilometers, the half a lap is 1/5 kilometers.
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3 years ago
-7d= -35 what is the answer
blagie [28]

Answer:

d = 5

Step-by-step explanation:

-7d = -35

Note the equal sign, what you do to one side, you do to the other. Isolate the variable, d. Divide - 7 from both sides:

(-7d)/-7 = (-35)/-7

d = -35/-7

d = 35/7

d = 5

d = 5 is your answer.

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3 years ago
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It is 4/27. Hope this helps you :)
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4 years ago
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A polling agency reported that 66 percent of adults living in the United States were satisfied with their health care plans. The
Tpy6a [65]

Answer:

A) The probability is 0.95 that the percent of adults living in the United States who are satisfied with their health care plans is between 63.6% and 68.4%.

Step-by-step explanation:

A polling agency reported that 66 percent of adults living in the United States were satisfied with their health care plans. The estimate was taken from a random sample of 1,542 adults living in the United States, and the 95 percent confidence interval for the population proportion was calculated as (0.636, 0.684).

This means that we are 95% sure that the true proportion of adults living in the United States who were satisfied with their health care plans is between 0.636 and 0.684.

So the correct answer is:

A) The probability is 0.95 that the percent of adults living in the United States who are satisfied with their health care plans is between 63.6% and 68.4%.

7 0
3 years ago
20 points helpp!!! i need it to be ready soon:/
Shkiper50 [21]

Answer:

Q7) 25.5

Q8) 25

Q9) 10

Q10) 12.7

Q11) 34

Q12) 24

Step-by-step explanation:

Q7) c² = a² + b²

x² = 18² + 18²

x = √18² + 18²

x = 18√2 = 25.5

Q8) c² = a² + b²

x² = 20² + 15²

x = √20² + 15²

x = 25

Q9) c² = a² + b²

26² = 24² + x²

x = √26²-24²

x = 10

Q10) c² = a² + b²

x² = 9² + 9²

x = √9² - 9²

x = 9√2 = 12.7

Q11) c² = a² + b²

x² = 30² + 16²

x = √30² + 16²

x = 34

Q12) c² = a² + b²

25² = x² + 7²

x = √25² - 7²

x = 24

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4 0
3 years ago
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