A medical researcher designs a drug to treat high blood pressure. She believes that people of different genders may respond differently to the new drug. What type of sample should be utilized to control for the possibility of different reactions based on gender? A. stratified random sample
B. systematic sample
C. self-selecting sample
D. random sample

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

Three times the sum of a number and seven is negative thirty-six. what is the number?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?