Please help me please i really need help please

Which expression is equivalent to the expression below? (6c^2 + 3c) / (-4c + 2) / (2c + 1) / (4c - 1)a. 3c(2c-1) / (2c + 1)b. -3c(2c-1)^2 / (2c + 1)^2c. 3cd. -3c(just took the test its d. -3c)

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

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