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4 years ago

HELP 30 POINTS!!!!!!!!!!!!!!!!!!!!! Please explain this!!!

Mathematics

2 answers:

finlep [7]4 years ago

7 0

First, multiply the first equation by 3 to get:

$3x+3y=-6$

Then, add the two equations together to get

$8x=16$

We can follow that x=2. Plugging in x=2, we get that y=-4.

Therefore, the solution of (2,-4)

Lynna [10]4 years ago

5 0

Answer:

[2, -4]

Step-by-step explanation:

{y + x = -2

{5x - 3y = 22

-⅕[5x - 3y = 22]

{y + x = -2

{-x + ⅗y = -4⅖

_______________

1⅗y = -6⅖

____ ____

1⅗ 1⅗

y = -4 [Plug this back into both equations above to get the x-coordinate of 2]; 2 = x

I am joyous to assist you anytime.

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5/6 times 3 = 15/18

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3 years ago

Find the product.<br> (4x - 3y) (2x + y)

antoniya [11.8K]

Answer:

8x^2 - 2xy + 3y^2

Step-by-step explanation:

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4 years ago

-3 + 5n > -13 <br> i need help on this someone please help

Butoxors [25]

Answer:

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Step-by-step explanation:

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8 0

3 years ago

Read 2 more answers

To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine foun

QveST [7]

Answer:

We conclude that the mean nicotine content is less than 31.7 milligrams for this brand of cigarette.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 31.7 milligrams

Sample mean, $\bar{x}$ = 28.5 milligrams

Sample size, n = 9

Alpha, α = 0.05

Sample standard deviation, s = 2.8 milligrams

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 31.7\text{ milligrams}\\H_A: \mu < 31.7\text{ milligrams}$

We use One-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$

Putting all the values, we have

$t_{stat} = \displaystyle\frac{28.5 - 31.7}{\frac{2.8}{\sqrt{9}} } = -3.429$

Now, $t_{critical} \text{ at 0.05 level of significance, 8 degree of freedom } = -1.860$

Since,

$t_{stat} < t_{critical}$

We fail to accept the null hypothesis and accept the alternate hypothesis. We conclude that the mean nicotine content is less than 31.7 milligrams for this brand of cigarette.

3 0

4 years ago

I need help with 23 please!!!

Sever21 [200]

Answer:

28 questions

Step-by-step explanation:

In the first 10 mins she answered 2/5 of 40 which is 16. The remaining amount is 24 questions and half of that is 12. So she answered 12 questions in 15 mins. Finally you add them to get 28 questions in 25 minutes.

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3 years ago