Show that (2a-1)^2-(2b=1)^2=x(a-b)(a+b-1) where x is an integer to be found.

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Complete the equation of the live through (-1,6) (7,-2)