Answer:

Step-by-step explanation:
Let
y ----> the number of rides
x ---> the number of games
we know that
The number of rides multiplied by $1 plus the number of games multiplied by $0.25 must be equal to $12 (the dollar amount Koran is spending)
so
The equation that represent this situation is

You can arrange them 16 times
1) aabb
2) aabb
3) bbaa
4) bbaa
5) abab
6) abab
7) abab
8) baba
9) baba
10) abba
11) baba
12) baab
13) baab
14) baab
15) baab
16) abba
Dont mind the sign until fourth step
First step: find divisibles of 90
1,2,3,5,6,9,10,15,18,30,45,90
Second step:find the pairs
1*90,2*45,3*30,5*18,6*15,9*10
Third step: find which one has a difference of 5
None of them is (expand this question more so i can help you)
4k(3n+2) this is basically just factoring out a common multiple which in this case is a k and a 4