Mary’s brain cannot directly process sound waves to hear what her boyfriend is saying. Instead, her sensory receptors detect sound waves and change them into signals that her brain can interpret as words in a process called:
A. absolute thershold
B. signal detection
C. transduction
D. sensory adaptation

Dominic and stacy each have a stamp collection. dominic has six fewer stamps than three times the number of stamps stacy has. dominic and stacy decide to give all of their stamps to their younger sister, mary. if stacy had s stamps, which expression represents the number of stamps that mary received? a. (3s − 18)(3s − 6) b. 2s − 18 c. 4s − 6 d. 4s − 18