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Rule of thumb, about 20 questions per section. How many questions that comes to total depends on your class of CDL and endorsements you're going for. For all classes, you'll have to take General Knowledge. If it's going to be an air brake equipped vehicle, you'll have to take air brakes (and perform your road test in a vehicle so equipped). If you're going for a Class A, you'll have to take Combination Vehicles. Then there's your endorsements... double/triple trailers, hazardous materials, passenger, tanker..
Class only has one syllable.
Engineers use trigonometry anywhere that involves non-right angles. That includes building cars and buildings, bridges, and many other structures. they also use trigonometry when dealing with fields, like magnetic and electric fields. Also, trigonometry is very important with engineers who deal with waves, such as sound or light engineers.
That depends what it is one third of.
One and a third of them.