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please help solve these question. I am taking this course online and need help.

Use a finite sum to estimate the average value all an the given interval by partitioning the interval into four suhintervals at equal length and evaluating fat the subinterval midpoints. 2 {(x) = ; on [2.10] The average value is . (Simplily your answer.) Write the sum without sigma notation. Then evaluate. M- sin ki k= 3 Write out the sum. 7 E sin kx = k= 3 Evaluate the sum. 7 E sin ki = (Simplify your answer.) k = 3Express the sum in sigma notation. 3 3 3 + 16 + 64 + 256 3 3 3 4 + 16 + 64 + 256 k =1 (Type an expression using k as the variable.)