Use the quadratic formula to find the solutions of x^2+3x−7=0. Give your answers as decimal approximations to the nearest thousandth. Write the decimal approximations for both solutions on the same line, separated by a comma.

How to do this , and can some one explain

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2 acellus answer