Find all real solutions of the quadratic equation. if there is no solution, state no solution.

w^2=7(w-4)

i got 7 plus or minus 3i times the square root of 7/2, but it says it's wrong.

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?