(Ms)Kisha is correct.
How?
Well, I figured this out by using common sense. 8 mangoes are 10 dollars. Since the price is higher than the amount, so it has to be at least more than one.
We could write more ratios. You can always write more ratios. You just multiply/divide both sides. Examples below:
2:5
16:20
The axis of symmetry would be -3 because it is always the (x) of the vertex
Answer:
The number of observations is 15.