Answer:
1. 12
2 a. 82
b. 63
c. 100
d 115(it's not possible because there is no grade above 100)
Step-by-step explanation:
1. 12×6=72
12+10+16+13+9=60
72-60=12
2. a. 85×4=340
78+80+100=258
340-258=82
b.85×4=340
90+92+95=277
340-277=63
c. 85×4=340
79+80+81=240
340-240=100
d.85×4=340
65+80+80=225
340-225=115
