What are the requirements that must be satisfied for a sample to be random? Check all that apply. a. Each individual has an equal chance of being selected. b. The proportions of all subgroups in the sample are equal to their proportions in the population. c. If more than one individual is selected, the probabilities stay constant for each individual selected. d. The sample is drawn without replacement.

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system