Pls help me with this questions pls. (pls don't spam)

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?