The constant is 3
................................
Step-by-step explanation:
1 = 1
2 = 3 − 1
3 = 3
4 = 1 + 3
5 = 9 − 3 − 1
6 = 9 − 3
7 = 9 − 3 + 1
8 = 9 − 1
9 = 9
10 = 1 + 9
11 = 9 − 1 + 3
12 = 9 + 3
13 = 1 + 3 + 9
Answer:
a) 22:24 simplified the answer is 11:12
b) 21:81 simplified the answer is 7:27
Step-by-step explanation:
not sure how you were taught but those could also be
a) 
or simplified the answer is 
b) 
or simplified the answer is 
What are you trying to say give more details
Answer:
9/20
Step-by-step explanation:
65 people swim or run
BUT
5 people just run
so
60 people swim or run
+
30 people swim and run
90/200 =
9/20
