Which is true in a balanced budget? choose exactly two answers that are correct. a. no single variable expense is greater than any of the fixed expenses. b. the total of all fixed expenses is equal to the total income. c. all fixed and variable expenses are listed. d. the total of all expenses is equal to the total income.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

50 points~ ! i have to turn this in tomarrow

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