Please help. How do I find the length of x?

Which best explains why this triangle is or is not a right triangle?

Run a linear regression to determine an equation (y=mx+b y=mx+b)

14. a family spends 1⁄10 of its annual income for housing, 1⁄4 for food and clothing, 1⁄5 for general expenses, and 2⁄15 for entertainment. what fractional part of their income is spent on these items altogether? a. 11⁄12 b. 41⁄60 c. 6⁄41 d. 1⁄7