The problem is called self-answering problems because the answers are embedded in the question. For...

The problem is called self-answering problems because the answers are embedded in the question. For example, how many ways can you arrange the letters in the word “six”? The answer is six. At time t=0, water begins pouring into an empty sink so that the volume of water is changing at a rate V′(t)=cos t. For time t=k, where \(0\leq k\leq \pi/2\)