Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?