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anyanavicka [17]

4 years ago

6

Anyone know how to factor 4x^2-4x-80?

1 answer:

andrezito [222]4 years ago

8 0

(x-5)(4x+16) Is the answer
ASK ME IF YOU GOT A QUESTION, I'M GLAD TO HELP. ;)

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Please help me on 26 it would mean a lot and plz show work

VARVARA [1.3K]

3/4 and 2/3 need to be converted.

4&3 both have the same multiple of 12. So both denominators become 12. For 3/4 you multiply 4 by 3 to get 12, so you also have to multiply 3 by 3 (to get 9) because you multiplied 4 by 3.(3/4 = 9/12)

Max = For 2/3 you multiply 3 by 4 to get 12, so you multiply 2 by 4. (2/3 = 8/12)

So Max painted 8/12 of the room.

3 0

3 years ago

Mr. Starnes wondered what proportion of Katy Perry's Twitter followers are

Citrus2011 [14]

Answer and Step-by-step explanation:

To calculate a confidence interval for a proportion:

1) Determine the proportion

$p=\frac{308}{500}$

p = 0.616

2) A 90% confidence interval has z-score that is 1.645.

3) Calculate margin of error

$ME=\sqrt{\frac{p(1-p)}{n} }$

where

n is the sample size

So

$ME=\sqrt{\frac{0.616(1-0.616)}{500} }$

$ME=\sqrt{\frac{0.616(0.384)}{500} }$

ME = 0.02175

Then the interval is given by

p ± z(ME)

0.62 ± 1.645(0.02175)

0.62 ± 0.035

The interval will be

0.585 < p < 0.655

What this means is that we are 90% confident that the true proportion of Katy Perry's Twitter female followers is between 0.585 and 0.655.

5 0

3 years ago

Arada [10]

Answer:

(a) Output = 37

(b) Input = 9

Step-by-step explanation:

Given

$y =x5 - 3$

Solving (a): Output, when input = 8

This means that, we solve for y when x = 8

So, we have:

$y =x5 - 3$

$y =8*5 - 3$

$y =40 - 3$

$y = 37$

Solving (b): Input, when output = 42

This means that, we solve for x when y = 42

So, we have:

$y =x5 - 3$

$42 = x5 - 3$

Collect like terms

$x5 = 42 + 3$

$x5 = 45$

Divide both sides by 5

$x = 9$

3 0

3 years ago

Which is f(-1) for the function f(x)= 3x^2+9

blsea [12.9K]

Answer:

C. f(-1) =12

Step-by-step explanation:

f(x)= 3x^2+9

Let x=-1

f(-1) = 3(-1)^2 +9

= 3(1)+9

= 3+9

= 12

f(-1) =12

4 0

3 years ago

Read 2 more answers

The maintenance department at the main campus of a large state university receives daily requests to replace fluorescent light b

oksano4ka [1.4K]

Answer: 34%

Step-by-step explanation:

Given : The distribution of the number of daily requests is bell-shaped and has a $\mu=35$ and $\sigma=6$ .

We can see that 41 = 35+6 , it 41 is one standard deviation from mean in the right side . (1)

According to the 68-95-99.7% rule, 68% of the population falls within 1 standard deviation from the mean.

34% (half of 68%) of the population on right side and 34% population on the left side of the density curve. (2)

From (1) and (2), the approximate percentage of light bulb replacement requests numbering between 35 and 41= 34%

4 0

3 years ago