Equation word problems three times gail’s age increased by two years equals twelve years

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?