On his first three tests, blake scored 81,74, and 100. what score must he get on his fourth test to have an average (mean) of 80 for all four test ?

Rick is driving to his uncles house in greenville, which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120