the table shows the original price of pencils. Which equation represents the price of pencils if they are on sale for half off

May someone me with these science questions

Select the correct answer. lisa and daisy work at a hair salon. the salon charges $18 for a hair styling session with lisa and $12 for a session with daisy. the income on a certain day is projected to be $216. this situation can be represented by the equation 18x + 12y = 216, where x is the number of lisa's customers and y is the number of daisy's customers. how many customers would lisa need to serve to attain the projected income if daisy calls in sick that day? (note: x ? 0, y ? 0, and x and y take only integer values.)

Technician a says that a cylinder leakage test fills the cylinder with compressed air and the gauge indicates the percentage of leakage. technician b says that a compression test can be used to test the condition of connecting rods. who is correct?