I want to estimate the population of dolphins in Ingall Bay. I capture and tag 20 dolphins before releasing them. I then capture 56 dolphins and 7 have tags. Estimate how many dolphins are in the bay.

If i have one apple and give you the apple, how many apples do i have?

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?