Answer:
2nd: 71 3rd: 73
Step-by-step explanation:
if mariana averaged 71 on her first three exams, it means in total, she scored 71*3 (213 points). since mariana scored 69 for her first exam, the other two exam scores must be 213-69 (144).
using systems of equations, we can identify two equations:
x is the first test, y is the second test, so x<y
x+y=144
x-y=-2
2y=144-(-2)
2y=146
y=73
if you plug in y (73), you can solve for x
x+73=144
x=144-73
x=71
