A(n)=4+4(n-1)
a(n)=4+4n-4
a(n)=4n
76=4n
n=19
The sum of any arithmetic sequence (series are infinite) is:
(a+a(n))(n/2)
The average of the first and last terms times the number of terms, in this case we found that n=19 so:
19(4+76)/2=760
The unknown number is n. So n is the unknown variable in the equation.
In order to write an equation in which n is included we must know some dependence of n with other values.
We know that <span>the difference of three times a number and 44 is −19. So, we can write:
3*n-44=-19
3*n=-19+44
3*n=25
n=25/3
</span>
Answer:
y=3x+2
Step-by-step explanation:
Answer:
The correct answer will be:
Step-by-step explanation:
It is given that :
Initial temperature, 
Final temperature,
Time taken :
Change in temperature per hour:
Putting the values of temperatures and time:
The error done by Wen was during calculating the values of fraction.
So, the correct answer is :
instead of 
Yes, percent is a number.
