Find the number if 6% of it is 20% of 6

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

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?