Randy and sandy have a total of 20 books between them. after sandy loses three by leaving them on the bus, and some birthday gifts double randy's collection, their total increases to 30 books. how many books did each have before these changes?

explanation : )

Randy had 13 books an Sandy had 7 books.

Step-by-step explanation:

20 - 3 = 17

30 - 17 = 13

13 x 2 = 26

26 + 4 = 30

13 + 7 = 20

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= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5