What makes the equation 4x+8=16 true?

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.

Which rational number could be graphed between -4 and -5

Write 17/20 as a decimal and as a percent.