From 1950 to 1990 the population of Country W increased by 40 percent. From 1990 to 2012 the population of Country W increased by 10 percent. What is the percent increase in the population of Country W from 1950 to 2012 ? Please explain.

Ihave trouble finding the nth term of a linear sequence

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14