Maria was riding her bike at a velocity of 3 m/s to the north. Her velocity changed to 11 m/s to the north. What was her change in velocity

Explanation:

Initial velocity to the north = 3 m /s

Final velocity to the north = 11 m /s

change in velocity = 11 - 3 = 8 m /s to the north .

change in velocity ( magnitude ) = 8 m /s

Direction of change in velocity = to the  north.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form