Complete the sentence with the phrase that makes the proof statement true. segment pr is perpendicular to segment qs. angle qrp is a right angle a. by the definition of perpendicular. b. because angle q is congruent to angle s. c. by the reflexive property of equality. d. because pqr is an isosceles triangle.

What situation is an example of an observational study

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.

You spend $13 to rent five movies for the weekend. new releases cost $3 and regular movies rent for $2. how many of the movies you rented were new releases and how many were regular movies? answer by substitution of systems.