An isosceles triangle has at least two congruent sides. the perimeter of a certain isosceles triangle is at most 12 in. the length of each of the two congruent sides is 5 in. what are the possible length of the remaining side?

a. s > = 5 but less than 12
b. s < = 12 but greater than 0
c. s < = 10 but greater than 0
d. s < = 2 but greater than 0

The length of one of the congruent side is 5
The total length of two congruent sides is 10

Perimeter at the most is 12 (meaning the maximum length of perimeter is 12) 
The third side of the triangle must be 12-10 = 2 at the most

Writing this requirement as inequality we have
but must be greater than 0

D

First year 5 more students.

Second year 105*0.05=5.25 more students.

Third year 110.25*0.05=5.5125 more students.

Which means there are 115.7625=116 students after 3 years.

Hope this helps :)