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3 years ago

Select all that have a value of 0. -cos pi/2 -cos 0 -sin 0 -sin 3pi/2 -tan pi

Mathematics

2 answers:

Lapatulllka [165]3 years ago

8 0

Sin 0 sin 3pi/2 and tan pi

cos pi/2 is -.5
cos 0 is 1

Zigmanuir [339]3 years ago

7 0

It's actually

Answer:1,3,and,5

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For which of these research situations would linear regression be the best statistical test to perform?

rjkz [21]

Answer:

C) independent variable = age

dependent variable = reaction time in milliseconds

Step-by-step explanation:

The linear regression statistical test is best used for research experiment where there is a single dependent and one independent variable whjre both variables are numeric. In the given options above, the city of residence, gender, college major and political affiliation are all possible categorical variables and age, salary, miles driven and reaction time are all numerical variables. Hence, the best situation in which to use linear regression is a test where both the independent and dependent variables are either age, salary, reaction time or miles driven.

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3 years ago

-1-4= 5-3x+4x Please help me! This is kind of confusing, and I don't really understand.

amid [387]

$-1-4= 5-3x+4x\\
-5=5+x\\
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8 0

3 years ago

Read 2 more answers

Ms. Monroe mixes 200 cubes of 4 different colors for a project. She then uses a scoop to place 20 cubes into each of 10 paper ba

Scilla [17]

Answer:

The mean no. of red cubes is more than the median no. of red cubes.

Step-by-step explanation:

According to the question, we can prepare the following table denoting the no. of bags containing any number of red cube(s). The no. of red cubes in each bag can theoretically be any no. between 0 and 20 (both end inclusive) as in total each bag contains 20 cubes of different colors.There are as a whole 10 bags (given).

No. of red cubes No. of bags $(x_{i}f_{i})$

$(x_{i})$ $(f_{i})$

0 2 0

1 0 0

2 2 4

3 1 3

4 1 4

5 0 0

6 1 6

7 2 14

8 1 8

9 0 0

10 0 0

Total 10 39

Now, no. of bags containing no. of red cubes above 10 is 0 [since there are as a whole 10 bags only]

So, from the table we get that mean no, of red cubes in each bag

= $\frac {\sum_{i =1}^{10}x_{i}f_{i}}{\sum_{i=1}^{10}f_{i}}$

= 39/10 = 3.9

Also, from the table, we get that, no. of bags with no. of red cubes ≤ 3

= (2 + 2 + 1) = 5

and, no. of bags with no. of red cubes ≥ 4

= (1 + 1 + 2 + 1) = 5

Also there are 1 bag each for no. of red cubes = 3 and 4

So. median no. of red cubes = (3 + 4)/2 = 3.5

So, we get that the mean no. of red cubes is more than the median no. of red cubes.

5 0

3 years ago

Read 2 more answers

What is x divided by x-1 - 1 divided by 2-2x expessed as a single fraction ?

Kay [80]

To simplify into 1 fraction, remember, we must make the denominator the same
x/ (x-1 ) - 1/ (2-2x)
= -x/ -(1-x) - 1/(2-2x) [see the similarity now? ] [whatever we multiply for the denominator, as long as we multiply to the numerator, it will be ok]
= -2x / -(2-2x) + 1/-(2-2x)
= (-2x+1 )/ -(2-2x)
=(2x-1)/(2-2x)

8 0

3 years ago

After a storm damages the community center, Shanika and her friends hold fundraising

Inessa [10]

Answer:

The total amount of money Shanika and her friends want to raise is $2400.

Step-by-step explanation:

Given:

After a storm damages the community center, Shanika and her friends hold fundraising.

After the first event, they raise $240, which is 10% of the total amount that they want to raise.

Now, to find the total amount of money that Shanika and her friends want to raise.

Let the total amount of money that Shanika and her friends want to raise be $x$ .

As given 10% of fundraise is $240.

So, according to question:

$10\%\ of\ x=\$240.$

$\frac{10}{100}\times x=240$

$\frac{10x}{100}=240.$

Multiplying both sides by 100 we get:

$10x=24000.$

Dividing both sides by 10 we get:

$x=\$2400.$

Therefore, the total amount of money Shanika and her friends want to raise is $2400.

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3 years ago