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Virty [35]
3 years ago
13

Can anyone help me with this. It asks to solve and check your answer.

Mathematics
1 answer:
Katarina [22]3 years ago
8 0
4m -21 = 3(5m - 1) 
4m - 21 = 15m - 3
15m - 4m = -21 + 3
11m = -18
m = -18/11

To check: 
LHS → 4 (-18/11)  -21 = - 303/11
RHS → 3( 5(-18/11) - 1) = -303/11
LHS = RHS (The answer is right)
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PLEASE HURRY Question 8 Multiple Choice Worth 4 points)
lawyer [7]

Answer:

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Step-by-step explanation:

roblox

5 0
3 years ago
You are planning a survey of starting salaries for recent computer science majors. In the latest survey by the National Associat
Ad libitum [116K]

Answer:

A sample size of at least 228 must be needed.

Step-by-step explanation:

We are given that in the latest survey by the National Association of Colleges and Employers, the average starting salary was reported to be $61,238. Assume that the standard deviation is $3850.

And we have to find that what sample size do we need to have a margin of error equal to $500 with 95% confidence.

As we know that the Margin of error formula is given by;

 <u>Margin of error</u> = Z_\frac{\alpha}{2} \times \frac{\sigma}{\sqrt{n} }

where, \alpha = significance level = 1 - 0.95 = 0.05 and  (\frac{\alpha}{2}) = 0.025.

            \sigma = standard deviation = $3,850

            n = sample size

<em>Also, at 0.025 significance level the z table gives critical value of 1.96.</em>

So, margin of error is ;

                        500=1.96 \times \frac{3,850}{\sqrt{n} }

                         \sqrt{n} = \frac{1.96 \times 3,850}{500}

                          \sqrt{n} = 15.092

 Squaring both sides we get,

                            n = 15.092^{2} = 227.8 ≈ 228

So, we must need at least a sample size of 228 to have a margin of error equal to $500 with 95% confidence.

4 0
3 years ago
What is the value of the expression 4x−y/2y x when x = 3 and y = 3? −3 1 9 18
ziro4ka [17]
(4x - y)/(2y + x) when x = 3 and y = 3 is
(4(3) - 3)/(2(3) + 3) = (12 - 3)/(6 + 3) = 9/9 = 1

5 0
4 years ago
-3b+7=13 solve for b
zzz [600]

Answer:

b = -2

Step-by-step explanation:

Start with your given:

-3b + 7 = 13

Subtract 7 on both sides:

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5 0
3 years ago
Read 2 more answers
How many triangles can be constructed with sides measuring 6 cm, 2 cm, and 7 cm?
andriy [413]

Answer:

 Option A- One                      

Step-by-step explanation:

Given that : The sides of the triangle  measuring 6cm, 2cm and 7cm.

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So, when we apply this theorem in 6cm,2cm and 7cm

6+2=8>7 , 7+2=9>6 , 7+6=13>2

It satisfy all three possible sets.

Therefore, the given values follows the triangle inequality.

Hence one triangle can be formed.

Therefore, option A is correct.


4 0
4 years ago
Read 2 more answers
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