Step 1: draw a right triangle. label the acute angles as angles a and b. label the right angle as angle c. step 2: prove the acute angles of a right triangle are complementary. given: triangle abc with angle c a right angle prove: angle a and angle b are complementary.

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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.

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?