Create an equivalent system of equations using the sum of the system and the first equation. X + 4y = 8
4x + y = 2
x + 4y = 8
5x + y = 2
Ox + 4y = 8
5x + 5y = 2
x + 4y = 8
4x + 5y = 10
0x + 4y = 8
5x + 5y = 10

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

Twenty-five percent of the customers entering a grocery store between 5 p. m. and 7 p. m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?