ah, thank you. I see what I did. I miswrote the -10x as a 10x which then caused me to end up with a 19x rather than a -(1)x.
oh yeah all of those over 2, forgot to mention that
not sure, the calculator is right there and majority of the problems are ez
40 and 41
Look up pythagorean triples for an explanation.
no, its an integer but only positive numbers can be whole numbers
