Glve the values of a, b, and c from the standard form of the equation (2x + 1)(x - 2) =0

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?

If rs 900 amounts to rs 1044 in 4 years, what sum will amount to 1368 in 3 1/2 years at the same rate