Answer:
4
Step-by-step explanation:
Let b represent the number of birds. Then the cost of care for b birds and 16-b cats was ...
4.50b +6.50(16-b) = 96.00
-2.00b = -8.00 . . . . . . . . . . . . simplify, subtract 104
b = 4 . . . . . . . . . . . . . . . . . . . . .divide by -2
The number of birds at the shelter on Thursday was 4.