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3 years ago

Help me please solve x and y intercepts

Mathematics

1 answer:

elixir [45]3 years ago

6 0

Step-by-step explanation:

(1) x+10y=20, x=20,y=2

(2) 6x+y=-18, x=-3,y=-18

(3) 2x-9y=-36, x=-18,y=4

(4) x=-6,y=-15

(5) x=9,y=12

(6) x=-18,y=-3

(7) x=16,y=-6

(8) x=14,y=8

(9) x=-12,y=9

(10) x=-15,y=-6

(11) x=12,y=10

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Answer:

Step-by-step explanation:

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2 years ago

Simplify (4b+7)8b^2<br> Can someone help me please?

Fed [463]

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$32b^{3} +56b^{2}$

Step-by-step explanation:

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3 years ago

Read 2 more answers

83 random samples were selected from a normally distributed population and were found to have a mean of 32.1 and a standard devi

arlik [135]

Answer:

$\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}$

$4.525 \leq \sigma^2 \leq 7.602$

Now we just take square root on both sides of the interval and we got:

$2.127 \leq \sigma \leq 2.757$

Step-by-step explanation:

Information given

$\bar X=32.1$ represent the sample mean

$\mu$ population mean (variable of interest)

s=2.4 represent the sample standard deviation

n=83 represent the sample size

Confidence interval

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

The degrees of freedom given by:

$df=n-1=8-1=7$

The confidence level is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical values.

The excel commands would be: "=CHISQ.INV(0.05,82)" "=CHISQ.INV(0.95,82)". so for this case the critical values are:

$\chi^2_{\alpha/2}=104.139$

$\chi^2_{1- \alpha/2}=62.132$

The confidence interval is given by:

$\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}$

$4.525 \leq \sigma^2 \leq 7.602$

Now we just take square root on both sides of the interval and we got:

$2.127 \leq \sigma \leq 2.757$

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2 years ago

A phone company charges for service according to the formula: C(n) = 27 + 0.03n, where n is the number of min talked, and C(n) i

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Answer:

0.03

Step-by-step explanation:

Use the formula y=mx+b

m= slope

b= y-int

Rate of change can also be interpreted as the slope.

0.03

The initial value can be interpreted as the y-intercept.

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2 years ago

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Yes that is the correct answer

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