Which of the following functions should be used to solve problems involving a constant rate of change?

Which of the following is the standard form of a linear function?

Mr. Nilo, a mathematics teacher, charges Php200 per hour for tutorial service to a junior high school student. If he spends 3 hours tutoring per day, how much would he receive in 12 days?

Beverly’s car uses 15 liters of gasoline to travel 120 kilometers. At that rate, how many liters of gasoline will her car consume to travel 130 kilometers?

Joshua likes to read a magazine. He reads 50 pages in 2 hours. At the same rate, how many hours will it take him to read the remaining 150 pages?

Queenie is working in a restaurant and her hourly wage is Php51.68. Let x represents the number of hours workedand let represents the total amount earned. Which of the following functions best represents the total amount earned by day?

JC works as a salesman in a company that distributes top brands and latest model of cellular phones. He receives a commission of Php1,500 for every cellular phone unit he sells. On top of the commission, he receives a monthly salary of Php12,000. What is his commission if he sells 25 cellphones in a month?

Al John spent Php1,200 on N95 facemasks because of pandemic. Each facemask costs Php100. How many facemasks did he buy?

Jun Mark used 15 m of copper wire which weighs 1 kg. If a copper wire weighs 3.5 kg, how many meters is it?

Ranie worked in the store for 5 hours. He earned a total of Php1,500. How much does he earn each hour?