Motor oils protect car engines over a range of temperatures. These oils have names like 10...

Motor oils protect car engines over a range of temperatures. These oils have names like 10W–40 or 5W–30. The following graph shows the temperatures, in degrees Fahrenheir, at which the engine is protected by a particular oil. Using the graph, find which oils can be used for the following temperatures.

a. Between –5° and 90°

b. Below –20°

c. Between –10° and 50°

d. From –20° to over 100°

e. From –8° to 90°