First three. A, b, c.
The triangle is a right triangle.
The triangle is a Pythagorean triple.
The triangles hypotenuse is 39 inches.
B
I do hope this is right please forgive me if this is wrong.
Option A is the answer
Since 29 + 39 = 68, the answer cannot be possible.
Essentially, any two sides of a triangle have to be greater than another side.
Add all 15 students' amounts: 14(68 inches), then add 65. Take the sum and divide it by 15 students, to get the mean. The answer is 67.8