Which statements describe a parallelogram that must be a rhombus?
select each correct answer.
1.parallelogram with congruent diagonals
2.parallelogram with a right angle
3.parallelogram with perpendicular diagonals
4.parallelogram with opposite sides congruent
5.parallelogram with a pair of congruent consecutive sides

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

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?

Enter your answer and show all the steps that you use to solve this problem in the space provided. write a list of steps that are needed to find the measure of ? b .