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nalin [4]
3 years ago
15

How to solve b/2= -4

Mathematics
1 answer:
kobusy [5.1K]3 years ago
6 0

Answer:

b = -8

Step-by-step explanation:

crossmultiply

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A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at th
OlgaM077 [116]

Answer:

Interval [16.34 , 21.43]

Step-by-step explanation:

First step. <u>Calculate the mean</u>

\bar X=\frac{(23+18+23+12+13+23)}{6}=18.666

Second step. <u>Calculate the standard deviation</u>

\sigma =\sqrt{\frac{(23-18.666)^2+(18-18.666)^2+(23-18.666)^2+(12-18.666)^2+(13-18.666)^2+(23-18.666)^2}{6}}

\sigma=\sqrt\frac{18.783+0.443+18.783+44.435+5.666+18.783}{6}

\sigma=\sqrt{17.815}=4.22

As the number of data is less than 30, we must use the t-table to find the interval of confidence.

We have 6 observations, our level of confidence DF is then 6-1=5 and we want our area A to be 80% (0.08).  

We must then choose t = 1.476 (see attachment)

Now, we use the formula that gives us the end points of the required interval

\bar X \pm t\frac{\sigma}{\sqrt n}

where n is the number of observations.

The extremes of the interval are then, rounded to the nearest hundreth, 16.34 and 21.43

6 0
3 years ago
What is the answer in multiple choice? Explain how you got it.
adoni [48]

Cost of the 3 shirts before  tax = 2*49.96 + 1/2 * 49.96

= $124.90

After adding 7.1% tax total cost  = 124.90 * 1.071 = $133.77

So the cost od each shirt = 133.77 / 3 = $44.59  (answer)

3 0
3 years ago
Read 2 more answers
What is W in this equation <br> -w–11≤w–5
zhannawk [14.2K]

Step-by-step explanation:

-w - 11 < or = w - 5

-2w - 11 < or = -5

-2w < or = -16

w > or = -8

5 0
3 years ago
Lee is replacing the carpet in the living room of the house. The living room is a rectangle 20 1/4 feet long 13 1/3 wide. A clos
gtnhenbr [62]

Answer:

100 ft

Step-by-step explanation:

5 0
3 years ago
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The sum of 3 times a number and 4 is between -8 and 10. Define a variable, write an inequality, and solve the problem.
Ilya [14]

<u>Understanding:</u>

The sum of 3 times a number (i'll define it as x) and 4 means 3x+4 is between -8 and 10 which means the value of 3x+4 is less than 10 and greater than -8. With that said, the inequality for that problem would be -8.

<u>Solving the problem:</u>

Now we know that -8, you can solve the problem by <em>subtracting 4</em> from each side then<em> dividing by 3.</em>

<em />

<em>-8-4</em>

<em />

<u>Final Answer:</u>

<u>-4</u>

6 0
3 years ago
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