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Reptile [31]
2 years ago
11

Which is the best first step when solving the following system of equations? 5 c + 4 d = 10. 3 c + 2 d = 16. Multiply the first

equation by Negative 2. Solve for d in the second equation. Solve for c in the first equation. Multiply the second equation by Negative 2.
Mathematics
1 answer:
Virty [35]2 years ago
8 0

Answer:

5c+4d=10

3c+2d=16

8c+6c=26

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J'Neices cell phone plan is $79 per month for unlimited calling plus 1000 text messages. Text messages over 1000 cost $0.15 each
BaLLatris [955]

Answer:

C. 244

Step-by-step explanation:

It costs 79 dollars a month = 79x

It costs 0.15 dollars for every text message over 1000 = 0.15y

The equation is:

79x + 0.15y = z

X = months

Y =  Each text message over 1000

Z = the total amount spent

Let's plug in our values

79(1) + 0.15(1100) = z

79 * 1 = 79

0.15 * 1100 = 165

79 + 165 = z

79 + 165 = 244

z = 244

C. 244

7 0
3 years ago
(−4x^4 +6x^2 +3) − (5x^2 - 3)
Alborosie

Answer:

-4x^{4} + x^{2} + 6

Step-by-step explanation:

(-4x^{4} + 6x^{2} + 3) - (5x^{2} - 3) = -4x^{4} + 6x^{2} + 3 - 5x^{2} + 3 = -4x^{4} + 6x^{2} - 5x^{2} + 3 + 3 =  -4x^{4} + x^{2} + 6

7 0
3 years ago
Seven less than one half of x
damaskus [11]

Answer:

X/2-7

Step-by-step explanation:

any number which is said to be less than another number let's say b should be subtracted from b.

7 0
3 years ago
1. Consider the data set 1,2,3,4,5,6,7,8,9.
ivanzaharov [21]

Answer:  a) Mean = 5, Median = 5

b) Mean = 15, Median = 5

c) Due to presence of outlier i.e. 99.

Step-by-step explanation:

Since we have given that

1,2,3,4,5,6,7,8,9

Here, n = 9 which is odd

So, Mean would be

\dfrac{1+2+3+4+5+6+7+8+9}{9}=\dfrac{45}{9}=5

Median = (\dfrac{n+1}{2})^{th}=\dfrac{9+1}{2}=5^{th}=5

If 9 is replaced by 99,

1,2,3,4,5,6,7,8,99

So, mean would be

\dfrac{1+2+3+4+5+6+7+8+99}{9}=\dfrac{135}{9}=15

Median would be same as before i.e. 5

The mean is neither central nor typical for the data due to outlier i.e. 99

Hence, a) Mean = 5, Median = 5

b) Mean = 15, Median = 5

c) Due to presence of outlier i.e. 99.

5 0
3 years ago
What is the length of the hypotenuse of triangle ABC? Round your answer to the nearest tenth. A) 2.5 m B) 4.3 m C) 5.5 m D) 18.2
Natasha2012 [34]
Hypotenuse= \sqrt{1.5^{2}+ 4^{2}  }
=4.27
7 0
3 years ago
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