Answer:
perimeter = 17t +9 feet
Explanation:
width W = 7t - 1.5
length L = 1.5t + 6
Perimeter = 2W + 2L
substitute expressions for W & L: 2(7t - 1.5) + 2(1.5t + 6)
expand: 14t - 3 + 3t + 12
collect like terms: 14t + 3t - 3 + 12
combine like terms: 17t +9
** can't give an exact value for the perimeter as don't have a value for t **