Based on what you wrote. This is not a exponential function.
Answer: 30+15 = 45
Step-by-step explanation: your welcome
Answer: 
Step-by-step explanation:
Negative four -> 
Times the sum of a number and 3 -> 
Is at least 28 -> 
Each eraser was $4.
6+4(3)=18
6+12=18
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