The difference between three times a number and 15 is equal to 6. find the number

Hunter designs two flags for his adventure club. what is the length of the base, x, of the larger flag? enter your answer, as a decimal, in the box.

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1