It's sometimes in traffic It's sometimes on bread It's stuck in a printer Or a song in your head What am I?

My maths teacher told me that altering an integral relating to a triangle was wrong. What did that leave me doing?

Not many words to choose from here. Requires eighteen wisdom and eighteen intelligence. A quality or state possessed by Stephen Hawking, a wise old grandmother and Ken Jennings. Start with what happens after you study, then something cats try to empty. Follow with singular for a well toned stomach, then what you call you. Next what was done to a firecracker, then finish with a plaintive single letter you might utter now.

A tropical crown with a spiky stance, sweet and tangy, it wears its armor well. It’s a fruit that dances on pizzas, causing culinary debates to swell.

High we score, in pieces we break. I don't think you need to pay a rake.