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Anit [1.1K]
3 years ago
11

Choose all correct answers. Which of the following are solutions of the system? y < 3 and x + y > 8

Mathematics
1 answer:
Shalnov [3]3 years ago
7 0
Its either (10,0) or (9,2) sorry i couldn't be more help
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8i-(12-4i)+7√-9<br><br> show work please
Tanya [424]

Answer:

33i - 12

Step-by-step explanation:

8i - (12 - 4i) + 7 \sqrt{ - 9}   \\  = 8i - 12  + 4i + 7 \sqrt{9  \times ( - 1)}  \\ = 12i - 12 + 7 \times 3 \sqrt{ - 1}  \\ = 12i - 12 + 21i  \:  \: ( \because  \sqrt{ - 1} = i)\\  = 12i + 21i - 12 \\   \therefore \red{ \bold{8i - (12 - 4i) + 7 \sqrt{ - 9} }=  \purple{ \bold{33i - 12}}}

5 0
3 years ago
What is the first step in solving quadraric equations by finding square roots??
Natalka [10]

Answer:

b I think. I think so yeah

3 0
2 years ago
Michael stands 10 feet from a table, and notices a plate resting on the edge of the table. The top of the table is 3 feet high,
Aleks04 [339]

Answer:

17

Step-by-step explanation:

quick mafs

3 0
2 years ago
You are curious about the average number of yards Matthew Stafford throws for each game for the Detroit Lions. You randomly sele
Damm [24]

Answer:

The margin of error for this estimate is of 14.79 yards per game.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

T interval

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 20 - 1 = 19

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.093

The margin of error is:

M = T\frac{s}{\sqrt{n}}

In which s is the standard deviation of the sample and n is the size of the sample.

You randomly select 20 games and see that the average yards per game is 273.7 with a standard deviation of 31.64 yards.

This means that n = 20, s = 31.61

What is the margin of error for this estimate?

M = T\frac{s}{\sqrt{n}}

M = 2.093\frac{31.61}{\sqrt{20}}

M = 14.79

The margin of error for this estimate is of 14.79 yards per game.

3 0
3 years ago
What's the answer?<br> Idk it bc I'm stupid and I don't feel like doing it
padilas [110]
The initial height is 4
after 2 seconds, the height is 8
Brainliest answer, please?
6 0
2 years ago
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