Answer:
25
Step-by-step explanation:
1500 total surveys sent
Returned: 245 + 173 + 185 + 92 = 695
1500-695 = 805
The system of equations has one solution
Answer:
12
Step-by-step explanation:
Listing the weeks he will attend each item
Class 4,8,12,16
Chess 2,4,6,8,10,12
Fencing 3,6,9,12
Starting today at week 0, he will attend all 3 again at week 12