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 Fahrenheit, 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˚
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