Alex wants to find out how many ducks there are in a park.
one day he puts a tag on each of 30 of the ducks.
the next day he catches 40 ducks.
8 of these ducks have tags on them.
work out an estimate for the number of ducks in the park.

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.