The position of the particle moving in space at time t ≥ 0 is r(t) = (2 + 2 cos(t))i − 2 sin(t)j + (3 − t π )k. Find the first time moment t0 such that the velocity vector v(t0) is orthogonal to the vector i − j.

Pls will give brainliest and all p.s u can zoom in if u cant see plss

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

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