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3 years ago

#14 i

Mathematics

1 answer:

ivann1987 [24]3 years ago

7 0

Answer:

Incorrect/No

Step-by-step explanation:

7x2=14

-7x2=-14

Follow the below guidelines:

A positive number times a positive number is a positive number
A negative number times a positive number is a negative number
A positive number times a negative number is a negative number
A negative number times a negative number is a positive number

Looking at the last one, we see that -2x-7=14, a positive number

Hope this helps!

--Applepi101

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Suppose a researcher is interested in understanding the variation in the price of store brand milk. A random sample of 36 grocer

liberstina [14]

Answer: ($3.055, $3.205)

Step-by-step explanation:

Given : Significance level : $\alpha: 1-0.95=0.5$

Critical value : $z_{\alpha/2}=1.96$

Sample size : n= 36

Sample mean : $\overline{x}=\$\ 3.13$

Standard deviation : $\sigma= \$\ 0.23$

The confidence interval for population mean is given by :_

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

$\text{i.e. }\$\ 3.13\pm (1.96)\dfrac{0.23}{\sqrt{36}}\\\\\approx\$\ 3.13\pm0.075\\\\=(\$\ 3.13-0.075,\$\ 3.13+0.075)=(\$\ 3.055,\$\ 3.205)$

Hence, the 95% confidence interval to estimate the population mean = ($3.055, $3.205)

3 0

3 years ago

PLEASE HELP!!!! Will be rewarded brainliest!!

kozerog [31]

Answer:

9.5

Step-by-step explanation:

If c to a is 19 then you divide the distance by 2 and you get 9.5 for the two distances.

3 0

3 years ago

Evaluate the expression when x=1/3 and y=-7/4 3x+y

dolphi86 [110]

Answer) -3/4 or decimal form -0.75

4 0

3 years ago

Read 2 more answers

Which points are separated by a distance of 4 units? a. (7,7) (1,7) b. (3,3) (1,3) c. (4,2) (8,2) d. (2,4) (5,4)

elena55 [62]

Answer:

Step-by-step explanation:

with the knowledge that we are comparing the x position we can get the equation |x_1-x_2|=4, then just do the maths

7 0

3 years ago

Solve. x^2+5x−2=0 Enter your answers as exact values.

asambeis [7]

The polynomial is not factorable, so we use the quadratic formula.

x^2 + 5x − 2 = 0

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$x = \dfrac{-5 \pm \sqrt{25 + 8}}{2}$

$x = \dfrac{-5 \pm \sqrt{33}}{2}$

$x = \dfrac{-5 + \sqrt{33}}{2}~~or~~x = \dfrac{-5 - \sqrt{33}}{2}$

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5 0

3 years ago