Solve the equation 4c2 + 7c – 5 = 0 using the quadratic formula.

The sum of two numbers is 12 and their difference is 18 what are the two numbers

The length of a rectangular piece of land is 92 yards more than three times its width. the perimeter is 760 yards. find its dimensions.

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?