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By itself you cannot. You need to have a set of values for the variables and the expression which you need to solve.
To evaluate means to find the value. Substitute the values of the variables and calculate the value. [You may need to solve for the values of the variables first.]
No, they need not.
You need to determine the area under the curve between the values in question. This is easy to do because there are tables that give the area values.
i don't know the answer, and i am the one who typed the question, and i relly need this for my math home work pls help me.