What is X+x+x+2 equivalent to?

The Quadratic Formula, , was used to solve the equation. 2x2 − 8x + 7 = 0. Fill in the missing denominator of the solution.

andrey2020 [161]

Answer:

theanswer is garanteed 4

Step-by-step explanation:

i just took a test tries -16, 2, and 14 and they were all wrong and then it told me the answer was 4. hope it helps!

8 0

3 years ago

A window in the shape of a parallelogram has a base of 36 inches and a height of 45 inches. What is the area of the window?

Finger [1]

The answer is
1620in²

hope its right

5 0

3 years ago

I need help on these thanks

olga nikolaevna [1]

Answer:

See below

Step-by-step explanation:

Line passes through the origin and has same x and y coordinate pairs,

y = x

<u>Points:</u>

(0, 3), (6, 1)

<u>The slope is:</u>

m = (1 - 3)/6 = -2/6 = -1/3

y = -1/3x + 3

<u>Points:</u>

(-1, 5), (0,1)

<u>The slope:</u>

m = (1 - 5)/(0 + 1) = - 4

y = -4x + 1

7 0

3 years ago

An NBA Basketball court is a rectangle that is 94 feet long and 50 feet wide. What is the area of the court? What is the perimet

Triss [41]

Answer:Area = 4700 feet squared

Perimeter= 288 feet

Step-by-step explanation:

Length = 94 feet

Width = 50 feet

Area = Length × Width

= 94 feet × 50 feet

= 4700 feet squared

Perimeter = 2(Length + Width)

= 2(94 feet + 50 feet)

= 2(144 feet)

= 288 feet

4 0

3 years ago

Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week.

mezya [45]

Answer:

a) The 90% confidence interval would be given by (18.52;20.49)

b) The 95% confidence interval would be given by (18.32;20.68)

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X=19.5$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=5.2$ represent the population standard deviation

n=75 represent the sample size

2) Confidence interval 90%

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that $z_{\alpha/2}=1.64$

Now we have everything in order to replace into formula (1):

$19.5-1.64\frac{5.2}{\sqrt{75}}=18.515$

$19.5+1.64\frac{5.2}{\sqrt{75}}=20.485$

So on this case the 90% confidence interval would be given by (18.52;20.49)

3) Confidence interval 95%

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.025,0,1)".And we see that $z_{\alpha/2}=1.96$

Now we have everything in order to replace into formula (1):

$19.5-1.96\frac{5.2}{\sqrt{75}}=18.323$

$19.5+1.96\frac{5.2}{\sqrt{75}}=20.677$

So on this case the 95% confidence interval would be given by (18.32;20.68)

5 0

3 years ago