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3 years ago

I don't get this at all , need asap thank you !!

Mathematics

1 answer:

Mkey [24]3 years ago

3 0

The formula of a trapezoid is the sum of the both bases multiplied by the height then divided by 2.

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Simplify the expression -2d + -2d - 9 + -9

makvit [3.9K]

Answer:

-4d-18

Step-by-step explanation:

Combine like terms:

-2d and -2d can combine since they have the same variable of d creating the term of -4d and -9 and -9 can combine to create -18. Put those together and you get the answer above.

3 0

3 years ago

Read 2 more answers

Families USA, a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers. It fo

Harman [31]

Answer:

(a) The 90 percent confidence interval for the population mean yearly premium is ($10,974.53, $10983.47).

(b) The sample size required is 107.

Step-by-step explanation:

(a)

The (1 - α)% confidence interval for population mean is:

$CI=\bar x\pm t_{\alpha/2, (n-1)}\times \frac{s}{\sqrt{n}}$

Given:

$\bar x=\$10,979\\s=\$1000\\n=20$

Compute the critical value of t for 90% confidence level as follows:

$t_{\alpha/2, (n-1)}=t_{0.10/2, (20-1)}=t_{0.05, 19}=1.729$

*Use a t-table.

Compute the 90% confidence interval for population mean as follows:

$CI=\bar x\pm t_{\alpha/2, (n-1)}\times \frac{s}{\sqrt{n}}$

$=10979\pm 1.729\times \frac{1000}{\sqrt{20}}\\=10979\pm4.47\\ =(10974.53, 10983.47)$

Thus, the 90 percent confidence interval for the population mean yearly premium is ($10,974.53, $10983.47).

(b)

The margin of error is provided as:

MOE = $250

The confidence level is, 99%.

The critical value of z for 99% confidence level is:

$z_{\alpha/2}=z_{0.01/2}=z_{0.005}=2.58$

Compute the sample size as follows:

$MOE= z_{\alpha/2}\times \frac{s}{\sqrt{n}}$

$n=[\frac{z_{\alpha/2}\times s}{MOE} ]^{2}$

$=[\frac{2.58\times 1000}{250}]^{2}$

$=106.5024\\\approx107$

Thus, the sample size required is 107.

4 0

3 years ago

Simplify (4x^2 - 8xy + 2y^2) - (9x^2 - 4xy - 7y^2)

NARA [144]

Answer:

Step-by-step explanation:

Distribute parenthesis and collect like terms, noting that the second parenthesis is distributed by - 1

(4x² - 8xy +2y²) - (9x² - 4xy - 7y²)

= 4x² - 8xy + 2y² - 9x² + 4xy + 7y² ← collect like terms

= (4x² - 9x²) + (- 8xy + 4xy) + (2y² + 7y²)

= - 5x² - 4xy + 9y² → b

4 0

4 years ago

Read 2 more answers

A school is arranging a field trip to the zoo. The school spends 615.65 dollars on passes for 33 students and 2 teachers. The sc

Aneli [31]

Answer:

the answer is $26.38

Step-by-step explanation:

I hope this helps!

3 0

3 years ago

This is B now please help...???

Slav-nsk [51]

Your answer for this is C

4 0

3 years ago