C+a=630
a=630-c
2c+5a=2910 using a found above in this we have:
2c+5(630-c)=2910
2c+3150-5c=2910
-3c+3150=2910
-3c=-240
c=80
So 80 children attended the concert.
4;81
You subtract 5 from 9 to get 4; 5(9)= 45 9(4)=36 45+39=81
Hello there.
Linear regression is a useful tool that allows calculating approximate values for a function that passes through given points(with the best error possible). It is very useful in science to make an estimation of the comportment of movement, electricity and some decays.
For example, I will relate a case in a physics lab: We calculated the positions of a car in an air rail and the times. With this information, I was able to make a linear regression to calculate the Position function for that case.
Answer: It is proportional because 195/3 equals 65 and 325/5 equals 65 as well, so it is proportional.
Hope this helps! :)
