Which system of equations is equivalent to the following system?

4x + y = 4
2x + 7y = 28

(a) 4x + y = 4
−2x − 7y = 28

(b) 4x + y = 4
−8x − 28y = 112

(c) −28x − 7y = −28
2x + 7y = 28

(d) −8x − 2y = 8
2x + 7y = 28

Match the vocabulary to the proper definition. in probability, two events in which 1. conditional probability the outcome of one event is independent of the outcome of a second event. 2. dependent events in probability, two events in which the outcome of one event is dependent on the outcome of a second event. the probability of an event in which the outcome of the event is conditional on the outcome of one or more different events. 3. independent events

Suppose 38 lbs of coffee beans are required to produce 2 lbs of farmer's coffee. how many lbs of coffee beans are required to produce 309 lbs of farmer's coffee?

This stem-and-leaf plot represents the heights of the students on ralph’s basketball team. one student’s height is missing from the plot. if the mean height of all the students on the team is 61 inches, what is the missing height? a. 55 in. b. 59 in. c. 61 in. d. 65 in.