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2 years ago

Please help me:( I’m not very good with parabolas

Mathematics

1 answer:

steposvetlana [31]2 years ago

3 0

Answer:

Direction of the parabola: Down

Step-by-step explanation:

The value of the coefficient of x² (represented by a ) determines whether the graph opens up or down.

* If a is positive, the graph opens up.

* If a is negative, the graph opens down.

Since the coefficient of x² is -1, then it means that the graph of the parabola opens downward.

Please mark my answers as the Brainliest if you find my explanations helpful :)

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Use the quadratic formula to find both solutions to the quadratic equation

anygoal [31]

Answer:

The answer is in the photo

Step-by-step explanation:

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2 years ago

I NEED HELP WITH THESE TWO QUESTIONS PLZ DO NOT ANSWER IF YOU CANNOT EXPLAIN THE ANSWER

Murljashka [212]

9514 1404 393

Answer:

1. asymptotes: x=-6, x=6, y=0; zero: x=0

2. 20 blue fish

Step-by-step explanation:

1. The vertical asymptotes are where the denominator is zero. It factors as (x-6)(x+6), so will have zeros at x=-6 and x=6.

The horizontal asymptote is at the limit when x goes to infinity. Here, the ratio of highest-degree terms is 6/x, so the value goes to zero as x gets large.

The zero is where the numerator is zero, at x=0.

In summary:

vertical asymptotes: x = ±6
horizontal asymptote: y = 0
zero: (0, 0)

2. 60% are red, so 40% are blue. The difference in percentages is 60%-40% = 20%. The percentage of blue fish (40%) is twice the difference (=2×20%), so the number of blue fish is twice the difference in numbers.

blue fish = 2×10 = 20 fish

Check

There are then 20+10=30 red fish, so 20+30=50 fish total. Reds are 30/50 = 60% of the total.

Additional comment

I find it often works well to work with ratios, which I can often do in my head. Other folks like to see equations. Here, we could write equations like ...

r = 60%(r + b) . . . . reds are 60% of the total

r - b = 10 . . . . . . . . 10 more reds than blues

We want the value of b, so we can eliminate r by substituting for it:

r = 10 + b . . . . from the second equation above

(10 +b) = 0.60((10 +b) + b) . . . . substitute for r

10 +b = 6 + 1.2b . . . simplify

4 = 0.2b . . . . subtract b+6

20 = b . . . . . . multiply by 5 (there are 20 blue fish)

6 0

2 years ago

A chest shaped as a rectangular prism can hold 432 wooden cube blocks with edge lengths of 1/3 ft.

andre [41]

Answer:

The answer would be 9.

Step-by-step explanation:

you have to multiply 1/4 three times which gives you 1/64 then you take 576 and multiply it by 1/64 which gives you 9. Hope this helps.

5 0

2 years ago

Read 2 more answers

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard devia

gtnhenbr [62]

Answer:

$n=(\frac{2.58(58.2)}{1})^2 =22546.82 \approx 22547$

So the answer for this case would be n=22547 rounded up to the nearest integer

Step-by-step explanation:

Let's define some notation

$\bar X$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma=58.2$ represent the population standard deviation

n represent the sample size

$ME =1$ represent the margin of error desire

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =+1 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 99% of confidence interval now can be founded using the normal distribution. The significance would be $\alpha=0.01$ and the critical value $z_{\alpha/2}=2.58$ , replacing into formula (b) we got: