3 years ago

Factor each expression. Problem: r^2 +12r +27 Answer: (r + 3) (r + 9)

1 answer:

3 0

Think of it like this, what two numbers when multiplied together, you get 27, and when they add together, you get 12? The answer is 9 and 3,
Your answer here would be (r+9)(r+3) when factored.

You might be interested in

Question ok iterations help would be greatly appreciated!

Alexandra [31]

your answer would be A. I would hope this is right

6 0

3 years ago

A human hair is approximately 40 microns (um) wide. If 1 um is equal to 10

Natasha2012 [34]

Answer:

D 40,000nm

Step-by-step explanation: 1nm/10^-9m * 10^-6/1um = 10^3 nm/um

Therefore in 40 microns there are:

40um * 10^3 nm/um = 40 * 10^3 nm = 40,000 nm

5 0

2 years ago

Me ayudan xfaaaaaa (':

IceJOKER [234]

Answer:

$2(z + 8) 3 \\$

4 0

3 years ago

Sarah predicts that 15 percent of all the birds she spots while bird watching will be robins. At the end of the day, she records

8_murik_8 [283]

Apply hypothesis testing

4 0

3 years ago

Read 2 more answers

On a standardized exam, the scores are normally distributed with a mean of 145 and a standard deviation of 25. Find the z-score

Kryger [21]

Answer:

z = 2.6

Step-by-step explanation:

<u>Use the formula for z-score</u>

$z=\frac{x-\mu}{\sigma}\\ \\z=\frac{210-145}{25}\\ \\z=\frac{65}{25}\\ \\z=2.6$

This tells us that this person's score of 210 places them 2.6 standard deviations above the mean

5 0

2 years ago