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3 years ago

WHICH OF THE FOLLOWING IS EQUIVALENT TO 4b +9a -2a + 5b A -2 a+14 b

Mathematics

1 answer:

Nataly_w [17]3 years ago

3 0

Grou plike terms

4b+9a-2a+5b
4b+5b+9a-2a
9b+7b

the closest one is C, but that has -7b instead of +7b

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Show twelve in four different ways use words pictures and numbers

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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. Calculate the mean

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

Second step. Calculate the standard deviation

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

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

$\sigma=\sqrt{17.815}=4.22$

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

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

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

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3 years ago

Mr. Chu's cherry tree grew 12 inches in

DanielleElmas [232]

Answer:

16 inches after one year

Step-by-step explanation:

in 3/4 a year tree grew 12 inches

divide by 3

multiply by 4

16 inches

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3 years ago