If machine a makes a yo-yo every five minutes and machine b takes ten minutes to make a yo-yo, how many hours would it take them working together to make 20yo−yos?

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the y-axis, then the shell method must be used. bold c. if a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y.

Which of the following is true for the relation f(x)=2x^2+1