Part A A medication has a half-life of 4 hours after it enters the bloodstream. A nurse administers a dose of 225 milligrams to a patient at noon.
Match each time with an expression that represents the amount of medication, in milligrams, in the patient’s body at that time.
Part B the choices are 6pm and 10pm

C. i believe it is (5×(-20))+(100×(0.7))

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.