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the last one D)4.5298 l check in calculator it did not come correct but I say the last one
19-14? I think first you need to find sea level.
So if 6 out of 40 are incorrect, 40-6= 36 must be correct.
In order to gain percentage you do proportions.
36/40 = x/100.
Multiply 36 times 100 then divide by 40, which is 90.
The answer is 90%.
90% of the questions he got were correct.
You would need to leave the dentist at 2:40.