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olga2289 [7]
2 years ago
8

URGENT PLEASE !!! answer correctly !!!!! Will be marking Brianliest !!!!!!!!!!!!!!!!

Mathematics
1 answer:
Liono4ka [1.6K]2 years ago
8 0

Answer:

B is (-2,-4)

Step-by-step explanation:

You might be interested in
What is the solution to the inequality + 4 ≤ 0?
erastova [34]
I assume you missed out the variable (I'll call it x), and meant:
x + 4 ≤ 0.

If that's the case, then the answer is:
x ≤ -4

If you did mean +4 ≤ 0, then the statement and therefore the answer is false.
5 0
3 years ago
A coin is tossed 71 times and 34 heads are observed. Is the coin fair? Use a 98% level confidence interval to base your inferenc
Fofino [41]

Answer:

a) \hat p=\frac{34}{71}=0.48 estimated proportion of heads observed.

b)  Se= \sqrt{\frac{0.479(1-0.479)}{71}}=0.0593

c) z_{\alpha/2}=2.33

d) 0.479 - 2.33 \sqrt{\frac{0.479(1-0.479)}{71}}=0.341

e) 0.479 + 2.33 \sqrt{\frac{0.479(1-0.479)}{71}}=0.617

f) In order to be fair the coin needs to have included the 0.5 on the interval, and for this case it's included, so we can say that at 2% of significance we can say that the coin is fair.

Step-by-step explanation:

Notation and definitions

X=34 number of heads observed.

n=71 random sample taken

\hat p=\frac{34}{71}=0.479 estimated proportion of heads observed.

p true population proportion of heads observed.

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})

The point estimator for the population proportion of heads is: Answer with two decimal precision.

\hat p=\frac{34}{71}=0.48 estimated proportion of heads observed.

The standard error in this estimate is: Answer with four decimal precision.

The confidence interval would be given by this formula

\hat p \pm z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}

And the standard error is given by:

Se= \sqrt{\frac{\hat p(1-\hat p)}{n}}

Se= \sqrt{\frac{0.479(1-0.479)}{71}}=0.0593

The correct table value for the 98% level confidence interval is: Answer with two decimal precision

For the 98% confidence interval the value of \alpha=1-0.98=0.02 and \alpha/2=0.01, with that value we can find the quantile required for the interval in the normal standard distribution.

z_{\alpha/2}=2.33

The lower end point of the CI is: Answer with three decimal precision.

And replacing into the confidence interval formula we got:

0.479 - 2.33 \sqrt{\frac{0.479(1-0.479)}{71}}=0.341

The upper end point of the CI is: Answer with three decimal precision.

0.479 + 2.33 \sqrt{\frac{0.479(1-0.479)}{71}}=0.617

And the 90% confidence interval would be given (0.341;0.617).

Based on the confidence interval, it is plausible that the coin is fair.

In order to be fair the coin needs to have included the 0.5 on the interval, and for this case it's included, so we can say that at 2% of significance we can say that the coin is fair.

4 0
3 years ago
PLEASE HELP!!! WILL GIVE BRAINLIEST!!!
777dan777 [17]

Answer: (2,2) and (-5,16)

Step-by-step explanation:

Here we have both Line (Linear Function) and Parabola (Quadratic Function)

So I am gonna write these equations here,

y=x^2+x-4\\y=-2x+6

The first equation has Parabola graph (Since it's second degree.)

and the second equation has line graph.

To find the intersection, you have to substitute either -2x+6 in first equation (Quadratic) or x^2+x-4 in second equation (Linear)

For me, I am going to substitute x^2+x-4 in y=-2x+6.

x^2+x-4=-2x+6

Now solve the equation and find the value of x.

Since it's Quadratic Equation (Because there's x^2) I'd move -2x+6 to the left side.

x^2+x-4+2x-6=0 Finish things here (Subtract and Addition)

x^2+3x-10=0 What two numbers multiply to 10? Find the factors of 10, that are [1 and 10] and [2 and 5]

Now think about it, do you think that if 1 and 10 subtract or even addition, do you think that it'd be 3? No, of course not.

So 2 and 5 is right.

(x-2)(x+5)=0 (5-2 = 3) and (5*(-2) = -10)

Then we get both x, x=2,-5

However, this is not it. You have to substitute both x in Linear Equation.

Substitute x = 2 in y=-2x+6

y=-2(2)+6\\y=-4+6\\y=2

Order = (2,2)

Then substitute x = -5 in y=-2x+6

y=-2(-5)+6\\y=10+6\\y=16

Order = (-5,16)

So the intersections are both (2,2) and (-5,16) as shown in graph below.

4 0
3 years ago
What is the answer for this fractoin 22 out of 40 equals ?
Hitman42 [59]

Answer:

0.55

Step-by-step explanation:

22/40 = 0.55

6 0
3 years ago
What is the product of -3 1/4 and -1 1/2
allochka39001 [22]

Answer:

4 and 7/8

Step-by-step explanation:

4 0
3 years ago
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