Someone pls help solve the area of this trapezium

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

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

Jalen charges $25.50 for every 3 hours of yard work he does for his neighbors. ralph charges $34 for every 4 hours of work that he does. who charges less? opinions: 1.they charge the same amount 2.jalen 3.ralph