three fifths candy bar
3/1 ÷ 5/1
3/1 × 1/5 = 3/5
step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:
the y coordinate for point b is 0, and answer b is the only one with that y coordinate.