Which number is not in scientific notation

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

An object in geometry with no width, length or height is a(n):