2 years ago

(3x-2)(3x-2) solve the problem using factoring

Mathematics

1 answer:

Effectus [21]2 years ago

5 0

9x squared - 6x - 6x + 4
9x squared - 12x + 4

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The length of a text messaging conversation is normally distributed with a mean of 2 minutes and a standard deviation of 0.5 min

Hitman42 [59]

Given:
μ = 2 min, population mean
σ = 0.5 min, population standard deviation

We want to find P(x>3).

Calculate the z-score
z= (x-μ)/σ = (3-2)/0.5 = 2

From standard tables, obtain
P(x ≤ 3) = P(z ≤ 2) = 0.9772
Therefore
P(x > 3) = P(z > 2) = 1 - 0.9772 = 0.0228

Answer: 0.02275

8 0

2 years ago

On the xy-plane, the graph of function f has x-intercepts at -3, -1, and 1. which of the following could define f?

vekshin1

X intercept is when y=0
or f(x) = 0
set the f(x)'s to 0
your answer is C
x-1=0 x+1=0 x+3=0
so x= -3, -1, and 1

7 0

2 years ago

You leave a 20% tip on your $70 dinner bill. How much was the tip

jonny [76]

$\frac{20}{100} \times70 = \frac{1}{5} \times 70 \\ = 14$
hey hope this helps

5 0

2 years ago

Which rate is the lowest price? <br> $3.00/6 lb<br> $2.50/5 lb<br> $2.40/4 lb<br> $2.40/6 lb

Oksi-84 [34.3K]

2.40/6 I believe tell me if it is right

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2 years ago

Read 2 more answers

Set X consists of 100 numbers. The average (arithmetic mean) of set X is 10, and the standard deviation is 4.6. Which of the fol

kompoz [17]

Answer:

E. 10 and 10

Step-by-step explanation:

Standard Deviation is the square root of sum of square of the distance of observation from the mean.

$Standard deviation(\sigma) = \sqrt{\frac{1}{n}\sum_{i=1}^{n}{(x_{i}-\bar{x})^{2}} }$

where, $\bar{x}$ is mean of the distribution.

Here, since standard deviation is the ratio of the distance from the mean and sample size. So for decreasing the standard deviation we should keep numerator constant and increasing the denominator.

This can be only possible in option (E).

Hence, only Option (E) is correct.

5 0

2 years ago