Which situation best represents the equation below? X - 15 = 60

A. Sandy collects seashells. She had 60 shells, but then she gave away 15 shells. How many shells does Sandy have in her collection?

B. Mr. Yung is 15 years younger than his brother. His brother is 60 years old. How old is Mr. Yung?

C. The school band is selling raffle tickets. They have already sold 15 tickets and have 60 remaining with how many raffle tickets did
they begin?

D. Daniella measures a 15 inch length of rope and attaches it to another length of rope. Together the two ropes are 60 inches in
length. How long was the piece of rope that Daniella attached?

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.