Answer:Perimeter=5*2+2*(x-2)
Step-by-step explanation:
Because perimeter =2*length+2*width
Answer: It will take
of an hour to complete the test.
Step-by-step explanation:
We need to convert the mixed number
to an improper fraction:

Now, we need to make the following add the fractions in order to calculate how many hours will it take to complete the test. Then, we get:

Therefore, it will take
of an hour to complete the test.
When we cube root 123, we get a decimal which rounds out to 4.97. So possible side lengths would be any number greater than that.<span />
The series 7 + 16 + 25 +34 +43 +52 + 61 is an illusration of arithmetic series
The sigma notation of the series is: 
<h3>How to write the series in sigma notation?</h3>
The series is given as:
7 + 16 + 25 +34 +43 +52 + 61
The above series is an arithmetic series, with the following parameters
- First term, a = 7
- Common difference, d = 9
- Number of terms, n = 7
Start by calculating the nth term using:
a(n) = a + (n - 1) * d
This gives
a(n) = 7 + (n - 1) * 9
Evaluate the product
a(n) = 7 - 9 + 9n
Evaluate the difference
a(n) = 9n - 2
So, the sigma notation is:

Read more about arithmetic series at:
brainly.com/question/6561461