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3 years ago

How many points of intersection are on the graph?

Mathematics

1 answer:

antoniya [11.8K]3 years ago

5 0

Answer:

2 and 1

Step-by-step explanation:

$y = {x}^{2} + 3x - 7 \: will \: have \: two \: points \: of \: \\intersection \\ \\ y - x = 9 \: will \: have \:only \: one\: point \: of \:\\ intersection$

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Is 3x+4y=8 parallel or perpendicular

daser333 [38]

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6 0

3 years ago

10 + 6x + 2x - 7 = 35<br> Help me pls and ty

lutik1710 [3]

Answer:

Explanation:

10 + 6x + 2x - 7 = 35

Add Similar Elements: 6x + 2x = 8x

10 + 8x - 7 = 35

Group Like Terms

8x + 10 - 7 = 35

Subtract: 10 - 7 = 3

8x + 3 = 35

Subtract 3 From Both Sides

8x + 3 - 3 = 35 - 3

Simplify

8x = 32

Divide Both Sides By 8

8x / 8 = 32 / 8

6 0

3 years ago

Read 2 more answers

I need help with this

VLD [36.1K]

Answer:

im sorry wish i could

Step-by-step explanation:

4 0

3 years ago

I need help please... I'll mark you brainiest!!! Thanks!

lys-0071 [83]

Multiply the weight in tonnes by the conversion factor ( 1 tonne = 1000 kg) to get the weight in kg's:

170 tonnes x 1000 = 170,000

Now convert to scientific notation, by moving the decimal point to have only 1 digit to the left of the decimal.

To do this, you would need to move the decimal 5 places to the left to get 1.70000

Now remove the 0's and multiply the number by 10 raised to the number of paces the decimal was moved to get:

1.7 x 10^5 kg's.

5 0

3 years ago

A survey was conducted that asked 1003 people how many books they had read in the past year. Results indicated that x overbar eq

Sergio [31]

Answer:

The 99% confidence interval would be given (11.448;14.152).

Step-by-step explanation:

1) Important concepts and notation

A confidence interval for a mean "gives us a range of plausible values for the population mean. If a confidence interval does not include a particular value, we can say that it is not likely that the particular value is the true population mean"

$s=16.6$ represent the sample deviation

$\bar X=12.8$ represent the sample mean

n =1003 is the sample size selected

Confidence =99% or 0.99

$\alpha=1-0.99=0.01$ represent the significance level.

2) Solution to the problem

The confidence interval for the mean would be given by this formula

$\bar X \pm z_{\alpha/2} \frac{s}{\sqrt{n}}$

We can use a z quantile instead of t since the sample size is large enough.

For the 99% confidence interval the value of $\alpha=1-0.99=0.01$ and $\alpha/2=0.005$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=2.58$

And replacing into the confidence interval formula we got:

$12.8 - 2.58 \frac{16.6}{\sqrt{1003}}=11.448$

$12.8 + 2.58 \frac{16.6}{\sqrt{1003}} =14.152$

And the 99% confidence interval would be given (11.448;14.152).

We are confident that about 11 to 14 are the number of books that the people had read on the last year on average, at 1% of significance.

3 0

3 years ago