The sum of three consecutive integers is 42. Which of the equations could represent this relationship? equations : x+(x+1)+(x+2)=42
x+(x+2)+(x+4)=42
(x-1)+x+(x+1)=42
(x-2)+x+(x+2)=42
x+2x+3x=42

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)