Over the weekend, rachel and morgan drove to chicago to go shopping. now they’re preparing to go home. morgan needs gas for her jeep, which gets 27 miles per gallon for gas mileage. when she stops at the gas station, she already has 8 gallons of gas in her tank. she buys more gas for $1.50 per gallon. if morgan spends 17.50 on gas, what is the total distance the girls could travel? if necessary, to the nearest tenth.

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