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What is the purpose of the outer ear? a. to convert mechanical waves into electrical waves b. to evaluate the quality of sound c. to convert sound waves into mechanical waves d. to collect and focus sound waves

Which of the following is necessary to build a skyscraper? a. wooden beams b. metal beams c. plastic supports d. all of the above

Daphne has calculated the total cost of a meal to be $5. she wants to make 70 percent on each meal. what will be the cost of the meal after adding the percentage? a. $8.50 b. $7.14 c. $3.50 d. $14.00