Abby, Mason, and Alyssa are siblings. Abby is twice as old as Mason. Mason is 12 years younger than Alyssa. In 5 years, Alyssa will be twice as old as Mason will be in 5 years. Find the ages of the siblings.

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.)

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.