X+ y = 21 3y + x = 19 which value of x is part of a solution to this system of equations?

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

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