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4 years ago

12

If oak wood for a wood stove sells for $100 a cord and fir sells for $90 a cord, what

1 answer:

ElenaW [278]4 years ago

7 0

Answer:

D $660

Step-by-step explanation:

90×4 = 360

100×3 = 300

300+360=660

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Two ride-sharing companies are competing for business in a large city. To help customers compare the companies, a data scientist

Solnce55 [7]

Solution :

Given :

$n_1 = n_2 = 40$

$\overline X_1 = 18$

$S_1 = 4$

$\overline X_2 = 12$

$S_2 =10$

So we want to test :

$H_0 : \mu_1=\mu_2$ vs $H_1 : \mu_1 \neq \mu_2$

a). For 98% confidence interval :

$=\left((\overline X_1 - \overline X_2) \pm Tn_1+n_2-2, \alpha / 2 \sqrt{\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}}\right)$

$=\left((18-12) \pm 2.375 \sqrt{\frac{4^2}{40}+\frac{10^2}{40}}\right)$

$=(6 \pm 4.0445)$

= (1.956, 10.045)

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3 years ago

Calculate the integral of f(x,y)=8x over the region  bounded above by y=x(2−x) and below by x=y(2−y).

Elden [556K]

Answer:

$\frac{1}{3}$

Step-by-step explanation:

Let's first find the intersection points.

$y = x(2-x)\\x = y(2-y)\\y = y(2-y)(2-y(2-y))\\x = x(2-x)(2-x(2-x))$

So intersection points for x = 0, 1 and for y = 0, 1.

Now, let's write x = y(2-y) instead of y.

$x - 1 = 2y - y^2 - 1\\x - 1 = -(y-1)^2\\1-x = (y-1)^2\\y = 1 - \sqrt{1-x}$

$\int_D f(x,y)dA=\int\limits^1_0[x(2-x)-(1-\sqrt{1-x})]dx=\\\\= (x^2-\frac{x^3}{3} -x-\frac{2}{3}(1-x)^{\frac{3}{2} } )|^1_0=-\frac{1}{3} +\frac{2}{3}= \frac{1}{3}$

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3 years ago

Determine the Domain of: 8(x)=(4)/(x-9)

Charra [1.4K]

Hi !

$f(x) = \frac{4}{x - 9}$

$x-9$ must be different from 0.

$x -9 \ne0 \\ x \ne9$

$= = > \: D_f=\mathbb{R}-\{9\}$

Have a nice day ;)

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2 years ago

A car is driving at a speed of 45mi/h. what is the speed of the car in feet per minute

Mama L [17]

<span>how many feet= 1mile
how many minutes = 1hr

5280ft=1mile
60mins=1hr
5280ft x 45mi = 237600
divide by 60
3960 ft per minute</span>

6 0

3 years ago

Read 2 more answers

Find n. 8/12 = n/48. n = ?

Novosadov [1.4K]

Answer:

n = 32

Step-by-step explanation:

<u><em>Given:</em></u>

<u><em></em></u> $\frac{8}{12}=\frac{n}{48}$

<u><em>Solve:</em></u>

<em /> $\mathrm{Cross\; Multiply:}$

<em /> $\frac{8}{12}=\frac{n}{48}$

$\mathrm{48\times8=384}$

$\mathrm{384\div12=32}$

$\mathrm{Hence,n=32}$

~ $\mathrm{[Kavinsky]}$

7 0

3 years ago

Read 2 more answers