If it takes 45 minutes to load 4 1/2 trucks how many minutes will it take to load 7 1/2 trucks

by proportion the answer is 45 * 7 1/2 / 4 1/2

= 45 * 15/.2 * 2/9

= 75 minutes

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:

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7