The continuous change in position of an object relative to a point of reference is?

What is the number 321,000,000 in scientific notation? also what is the number? ?

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.