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timofeeve [1]
3 years ago
10

What is 7a+21=56 and what is the solution

Mathematics
2 answers:
asambeis [7]3 years ago
7 0
7a+21=56

Begin by subtracting 21 on both sides:
21-21=0 so the 21 in the left cancels, then 56-21=35

Your new equation will be
7a=35

Finally, divide by 7 on both sides:
7/7=1 and 35/7=5

your answer will be
a=5
adoni [48]3 years ago
3 0
7a+21=56

Subtract 21 from 56

7a=35

Divide 35 by 7

Answer a=5
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Evaluate the expression 8-3×2+5
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Answer:

7

Step-by-step explanation:

First do 3x2 to get 6, and then do 8-6, which is 2, and add that to 5 to get 7

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We want to have a survey and ask people working for IT companies if they prefer Skype to mobile phones for making calls. We want
weqwewe [10]

Answer:

For this case we want to test if in IT companies more than 20% of employees prefer to use Skype rather than a mobile phone (alternative hypothesis) and the complement would be the the null hypothesis. So then the system of hypothesis are:

Null hypothesis: p =0.2

Alternative hypothesis: p >0.2

And for this case we should use a righ tail test based on the alternative hypothesis.

Step-by-step explanation:

Previous concepts

A hypothesis is defined as "a speculation or theory based on insufficient evidence that lends itself to further testing and experimentation. With further testing, a hypothesis can usually be proven true or false".  

The null hypothesis is defined as "a hypothesis that says there is no statistical significance between the two variables in the hypothesis. It is the hypothesis that the researcher is trying to disprove".  

The alternative hypothesis is "just the inverse, or opposite, of the null hypothesis. It is the hypothesis that researcher is trying to prove".  

Solution to the problem

For this case we want to test if in IT companies more than 20% of employees prefer to use Skype rather than a mobile phone (alternative hypothesis) and the complement would be the the null hypothesis. So then the system of hypothesis are:

Null hypothesis: p =0.2

Alternative hypothesis: p >0.2

And for this case we should use a righ tail test based on the alternative hypothesis.

6 0
3 years ago
I need help plsss<br> Nowww
enyata [817]
8: tenths
9:hundredth
7:thousandth
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3 years ago
I will give brainly :) NO LINKS
user100 [1]
4 12 18
:) fun little riddle
4 0
3 years ago
Read 2 more answers
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