Can someone help me with this it’s urgent what’s the answer or property of this problem C?

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)