i know the answer is a but explain : )

9. the graph of g(x) = 5x is a transformation of the graph of f(x) = x. which of the
following describes the transformation?
a stretched vertically
c reflected across the x-axis
b compressed vertically
d reflected across the y-axis

Adoctor administers a drug to a 38-kg patient, using a dosage formula of 50 mg/kg/day. assume that the drug is available in a 100 mg per 5 ml suspension or in 500 mg tablets. a. how many tablets should a 38-kg patient take every four hours? b. the suspension with a drop factor of 10 ggt/ml delivers the drug intravenously to the patient over a twelve-hour period. what flow rate should be used in units of ggt/hr? a. the patient should take nothing pills every four hours. (type an integer or decimal rounded to the nearest hundredth as needed.)