Dan is considering going hiking during the summer. He is comparing the prices of two companies that provide this service,
Nature Lovers charges $20 per hour for a personal guide plus a
$10 fee for the equipment. Hiking World charges $18 per hour for
a personal guide plus a $15 fee for the equipment. Dan wants to
determine the number of hours that Hiking World will cost less
than Nature Lovers. Let x represent the number of hours Dan will
spend hiking. Write an inequality to compare the total costs for
hiking at the two companies.

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