The graph shows the population of a city from 1900 to 2000. What is the average rate of change of the population between 1950 and 1980? Please help! I attached a photo of the graph.

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it. how many multiple-choice questions are on the test?

Which of the binomials below is a factor of this trinominal? x^2-13+30

Agraph of a trapezoid can have diagonals with slopes that are negative reciprocals and two pairs of adjacent sides that are congruent, true or false, and why