The answer is: 36
Because, bisecting the base of the triangle gives of two segments of five. This forms two triangles with base of 5 and altitude (in this case height) of 12. There exists a special pythagorean triplet triangled named 5-12-13 meaning if you have a right triangle with two of these sides then the unknown side is the number left out. In this case, the altitude forms a right angle on the base which allows the sides of the big isocs. triangle to be 13 giving us 13 + 13 + 10 to be the perimeter = 36.
The answer is 10 because if you count by 2 all the way to 18 you get 10
A.
You can either use long division or just plug it in and see which one works. It has to end with 11 because last number is 88. So either A or C then test those 2
.19 seconds
This is because 12.38-12.19= .19