If a river current flows at an average 3 miles per hour, then a tour boat makes the 9-mile tour downstream with the current and back the 9 miles against the current in 4 hours. what is the average speed of the boat in still water?

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

Which expression converts 45 degree to radians

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36