Which of these is an example of a random sample? A.
Every twentieth caller to an independent radio station receives tickets to a concert.

B.
A phone survey is conducted using twenty names randomly taken from the phone book.

C.
Customers buying a new cell phone are surveyed about cell phone plans.

D.
A phone plan company surveys people on the beach to see how well they are receiving service, and uses this information in future advertising.

answer: check all that apply, where the options?

step-by-step explanation:

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

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: