In mrs. robinson's class, there are 16 girls and 14 boys. the mean of the girls' heights is 63.7 inches, and the mean of the boys' heights is 65.4 inches. what is the mean of the heights of all 30 students? express your answer as a decimal to the near tenth.

Apiling for a high-rise building is pushed by two bulldozers at exactly the same time. one bulldozer exerts a force of 1250 pounds in a westerly direction. the other bulldozer pushes the piling with a force of 2650 pounds in a northerly direction. what is the direction of the resulting force upon the piling, to the nearest degree? a. 65 n of w b. 25 n of w c. 45 n of w d. 35 n of w

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Find the area of the surface obtained by rotating the curve z=4e^2y from y = 0 to y =1 about the y-axis. the area is square units