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3 years ago

Billy wants to hire a plumber to fix a faucet at his house. The plumber charges $125 initial fee and $85 per hour he is working.

Mathematics

1 answer:

o-na [289]3 years ago

4 0

Answer:

85x + 125 = y

Step-by-step explanation:

Let x = the amount of hours worked

Let y = the total cost to pay for this plumber

85 is the hourly pay so we multiply by the amount of hours worked to find the cost per hours. We then add that to the initial cost of 125 and we get the total cost.

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Which pair of points have equal x coordinates?<br>

olga_2 [115]

Answer:

Q and R

Step-by-step explanation:

Q = (-5, 6)

R = (-5, -7)

They both have the same x-coordinates.

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3 years ago

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Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. Here are data on the "penetr

Sonja [21]

Answer:

Step-by-step explanation:

Given that;

Compressed Soil 2.85 2.66 3 2.82 2.76 2.81 2.78 3.08 2.94 2.86 3.08 2.82 2.78 2.98 3.00 2.78 2.96 2.90 3.18 3.16

Intermediate Soil 3.17 3.37 3.1 3.40 3.38 3.14 3.18 3.26 2.96 3.02 3.54 3.36 3.18 3.12 3.86 2.92 3.46 3.44 3.62 4.26

Compressed soil intermediate soil

Mean 2.907 3.286

SD 0.1414 0.2377

Here we have,

$\bar x_1 =3.286\\ \bar x_2 =2.907\\s_1 =0.2377\\ s_2 =0.1414\\n_1=19\\n_2=20$

The pooled Standard deviation

$s_p=\sqrt{\frac{(n_1-1)s_1^2(n_2-1)s_2^2}{n_1+n_2-2} } \\\\=0.1943$

So standard error for difference in population mean is

$s_{\bar x_1 - \bar x_2} = \sqrt{\frac{s_p^2}{n_1}+\frac{s_p^2}{n_2} } \\\\=0.0623$

by inputting the values we get 0.0623

Degree of freedom for t is

df = 19 + 20 - 2 = 37,

so t-critical value is 2.715.

So required confidence interval for

$\mu_{1} - \mu_{2}$ will be

$( \bar x_1 - \bar x_2) \pm t_{critical}*s_{\bar x_1 - \bar x_2}$

$=0.3793 \pm2.715*0.063\\\\=0.3793\pm0.1690$

So required confidence interval is (0.2103 , 0.5483).

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3 years ago

Solve |2x+5| =15<br><br> Need help please!!!

Olin [163]

Answer:

applying absolute law

if |u|=a, a>0 then u=a or u=-a

2x+5=15 or 2x+5=-15

2x=15-5 or 2x=-15-5

2x=10 or 2x=-20

x=5 or x= -10

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2 years ago

okay like i really need to know the correct answer... so this problem says h/4 =6/7 (by the way these are written as fractions)

Musya8 [376]

Answer:

h = 24/7

Step-by-step explanation:

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3 years ago

A= 2x.(3x+6xy)<br> B=4x^{2}.(4x-5+8xy)

ehidna [41]

The value of the equation will be:

a. 6x² + 12x²y

b. 16x³ - 20x² + 32x³y

<h3>How to calculate the equation?</h3>

a. 2x.(3x+6xy)

The value of the equation will be:

2x.(3x+6xy)

= 6x² + 12x²y

B=4x².(4x-5+8xy)

= 16x³ - 20x² + 32x³y

Therefore, value of the equation will be:

a. 6x² + 12x²y

b. 16x³ - 20x² + 32x³y

Learn more about equations on:

brainly.com/question/2972832

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2 years ago