Which expression is equivalent to 3m+ 1 - m? 2+m-1+m O 1+m 3m-1 3m

Mathematics

1 answer:

Marizza181 [45]4 years ago

7 0

Answer:

2m-1+m

hope those answers help :)

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A rectangular prism is 4 meters long, 5 meters wide, and has a height of 7 meters. What is its surface area?

Elis [28]

The surface area is all the areas of all the exterior faces in a 3D shape.

Doing all the possibilities, 4 * 5 * 2 , 5 * 7 * 2, 4 * 7 * 2 = total surface area
40 + 70 + 56 = 166 m^2

The answer is 2. 166 m^2

6 0

3 years ago

A survey conducted in July 2015 asked a random sample of American adults whether they had ever used online dating (either an onl

Natasha2012 [34]

Answer:

The 99% confidence interval is (0.0787, 0.1613).

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 interval 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 $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

The survey included 411 adults between the ages of 55 and 64, and 50 of them said that they had used online dating. This means that $n = 411, \pi = \frac{50}{411} = 0.12$