Aferry takes several trips between points a and b. it moves at a constant speed of 0.35 miles/minute and takes the same route on each trip. the total duration of a round trip from point a to point b and back is 80 minutes, ignoring the time spent stopped at point b. if d is the ferry’s distance from point a in miles and t is the time in minutes, which equation models the ferry’s distance from point a for the duration of the trip?

Aresearch study is studying the effects of a new drug for osteoporosis alzheimer's disease (ad) for women above the age of 65 years. a group of individuals with osteoporosis is randomized into two groups. one group is treated conventionally, and the second group is treated with the new medication. assessments are made at 3, 6, 12, 36, and 48 months. the conventionally treated group is assessed for ad using a serum blood test, and the treatment group is assessed for ad using a pet radiotracer that binds to beta-amyloid plaques. in comparing these 2 trial arms, the authors of the study may encounter which type of bias? a. selection bias on the risk of developing b. measurement bias c. confounding bias d. recall bias e. lead-time bias