Which explains whether or not the graph represents a direct variation?

the graph has a constant of variation of 3, so it represents a direct variation.
the graph has a slope of 3, so it represents a direct variation.
the graph has a positive slope, so it does not represent a direct variation.
the graph does not begin at the origin, so it does not represent a direct variation.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Answer asap ! the shortest path from point a to point b goes through a pond. to avoid the pond, you must walk straight 34 meters along one edge of the pond, then take a 90 degree turn, and again walk straight 41 meters along another edge of the pond to reach point b. about how many meters would be saved if it were possible to walk through the pond? a. 11 m b. 20 m c. 30.45 m d. 21.73 m

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?