Which formula can be used to find the measure of angle a. 1/2(a°+b°) b. 1/2(a°-c°) c. 1/2(b°+c°) d. 1/2(a°-b°)

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