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lianna [129]
2 years ago
11

Solve 14−2x=28 using the replacement set {−21, −7, 7} .

Mathematics
1 answer:
timofeeve [1]2 years ago
4 0

Answer:

B

Step-by-step explanation:

substitute the values from the replacement set into the left side of the equation to find which values of x make it true.

x = - 21

14 - 2(- 21) = 14 + 42 = 56 ≠ 28 ← False

x = - 7

14 - 2(- 7) = 14 + 14 = 28 ← True

x = 7

14 - 2(7) = 14 - 14 = 0 ≠ 28 ← False

Thus x = - 7 is the solution

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Plz help me with this one..
Virty [35]

Answer:

The equations 3·x - 6·y = 9 and x - 2·y = 3 are the same

The possible solution are the points (infinite) on the line of the graph representing the equation 3·x - 6·y = 9 or x - 2·y = 3 which is the same line

Step-by-step explanation:

The given linear equations are;

3·x - 6·y = 9...(1)

x - 2·y = 3...(2)

The solution of a system of two linear equations with two unknowns can be found graphically by plotting the two equations and finding the coordinates of the point of intersection of the line graphs

Making 'y' the subject of both equations gives;

For equation (1);

3·x - 6·y = 9

3·x - 9 = 6·y

y = x/2 - 3/2

For equation (2);

x - 2·y = 3

x - 3 = 2·y

y = x/2 - 3/2

We observe that the two equations are the same and will have an infinite number of solutions

5 0
3 years ago
A right triangle has a length of 30 and a side with a length of 18. A side with a length of 24 is opposite angle theta. What sta
tekilochka [14]

Answer:

\text{A. }\cos \theta = \frac{3}{5}

Step-by-step explanation:

See attached file for complete work.

Download pdf
7 0
3 years ago
Tara bought 30 books at a yard sale she now has 220 books which equation can be solved to find b,the number of books Tara had be
OverLord2011 [107]

Answer:

Step-by-step explanation:

yes

6 0
3 years ago
Fifty percent of the customers who go to Sears Auto Center for tires buy four tires and 30% buy two tires. Moreover, 18% buy few
cestrela7 [59]

Answer:

A. Probability = 0.02

B. This is in a cumulative frequency table in the attachment I added

Step-by-step explanation:

A. We have these following probabilities

Prob(X=0) = 0.05

Prob(x= 2) = 0.30

Prob(X = 4) = 0.50

Prob(X < 2) = Prob(X=0) + prob(X=1)

0.18 = 0.05 + prob(X=1)

prob(X=1) = 0.13

A. Prob(x = 3)

= 1 - (0.05 + 0.13 + 0.30 + 0.50)

= 0.02

Probability of buying only 3 times = 2%

B. The cumulative frequency is in the attachment.

4 0
3 years ago
What the triangle sum
FinnZ [79.3K]

Triangle sum is 3 coz triangles have 3 sides.... if that’s not right then I dunno.... there was no picture that went with this question

3 0
4 years ago
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