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2 years ago

A quadratic function has the form y=ax^2 for some non-zero value of a and (4,48) is on the graph. what is the value of a?

Mathematics

1 answer:

kaheart [24]2 years ago

7 0

48=16a
48/16=a
3=a
^^^^^^^^^^

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Help me on this question. would be nice if you could also graph it as well

Gre4nikov [31]

Bro it definitely A I’m
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6 0

2 years ago

g A researcher wants to construct a 95% confidence interval for the proportion of children aged 8-10 living in Atlanta who own a

Helga [31]

Answer:

The sample size needed is 2401.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error of the interval is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

Estimate the sample size needed if no estimate of p is available so that the confidence interval will have a margin of error of 0.02.

We have to find n, for which M = 0.02.

There is no estimate of p available, so we use $\pi = 0.5$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.02 = 1.96\sqrt{\frac{0.5*0.5}{n}}$

$0.02\sqrt{n} = 1.96*0.5$

$\sqrt{n} = \frac{1.96*0.5}{0.02}$

$(\sqrt{n})^{2} = (\frac{1.96*0.5}{0.02})^{2}$

$n = 2401$

The sample size needed is 2401.

7 0

2 years ago

Read 2 more answers

Hi!!!<br>Calcula los divisores de cada número :<br>8, 12 ,24 , 25 , 28, <br>please . _ .

Kamila [148]

I think that it’s 23

6 0

2 years ago

What is the value of 4 in the number 358.547? A) 0.0004 B) 0.004 C) 0.04 D) 4

LiRa [457]

The answer is C) 0.04 becuase the 4 is in the hundredths place

3 0

2 years ago

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You are knitting a blanket. You want the area of the blanket to be 24 ft². You want the length of the blanket to be 2 feet longe

Finger [1]

With the facts you got here, you can make the following equation:

x*(x+2)=24

x^2+2x=24
x^2+2x-24=0

Then you can use the following formula (which you might have seen before):
x = (-b +/- sqrt(b^2-4ac))/2a

where
ax^2+bx+c=0

(-2 +/- sqrt(4+96))/2
(-2 +/- 10)/2

x_1 = 4
x_2 = -6

3 0

2 years ago