depending on what course you are taking, you can use limits to solve most of these, but if not, you simply say they do not exist.

a. 1/0 Divide by 0, does not exist

b. 1/INFINITY does not exist

c. INFINITY/0 divide by 0, does not exist

d. 0/INFINITY = 0 (0 divided by anything is 0)

e. INFINITY/1 = INFINITY (dividing in 1 piece is just itself)

f. INFINITY/INFINITY = 1 (x/x is always 1)

g. 0/0 = divide by 0, does not exist