Kitara has 100 quarters and dimes. their total value is $19. how many of each coin does kitara have?

Q + d = 100 so q = 100 - d
0.25q + 0.10d = 19

substitute q = 100 - d into 0.25q + 0.10d = 19

0.25q + 0.10d = 19
0.25(100 - d) + 0.10d = 19
25 - 0.25d + 0.10d = 19
-0.15d = -6
        d = 40

q = 100 - 40 = 60

answer
Kitara has 60 quarters and 40 dimes

number of students (thanks sophia!) . 5; 8.

Step-by-step explanation:

Reading the graph, students who practice three or more hours include the last 2 bars (3-3:59) and (4-4:59), similarly fewer than two is the first two bars. And to find how many students just add the values of the bars. 4 plus 1 is 5 (three hours or more) and 3 plus 5 is 8 (two hours or less)