Put these numbers in order from least to greatest.-12/40 -5 19/38

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Write a story that matches with the expression 42x-5 pls hurry

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?