If you have a single straight vertical line cross the curve at more than one point, then you do not have a function. In other words, if an x input leads to multiple outputs, then you don't have a function.
Step-by-step explanation:
log2 32= log32/log2= log 2^5/log2=5log2/log2=5 (log2=0.3)
log7 1= log1/log7= 0 (log1=0)
log5 625= log625/log5= log5^4/log5= 4log5/log5= 4 (log5=0.69)
Answer:
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