Select the best real-world problem for the equation x − 130 = 20. Then solve the equation. A Alf spent $130 on a physics text and found that he had only $20 left after his purchase. How much money did he have before buying the book? B Dan spent $130 on a physics text and found that he had only $20 left after his purchase. How much did the book cost? C Chuck spent $130 on a physics text and found that he had only $20 left after his purchase. How much money did he have after buying the book? D Bob spent $20 on a physics text and found that he had only $130 left after his purchase. How much did the book cost if it was taxed at a rate of 7.5%? The value of x is .

Question 5 spring semester final exam math evaluate

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

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.