In the following problems, use only the designated number keys on the calculator. You ma...

In the following problems, use only the designated number keys on the calculator. You may use any function keys.

a. Use the keys exactly once each in any order and use any operations available to write as many of the whole numbers as possible from 1 to 20. For example, 9 — 7 — 1 = 1 and

b. Use the key as manly times as desired with any operations to display 13.

c. Use the key three times with any operations m display 24.

d. Use the key five times with any operations to display 100.