What is the coefficient of the term x5y7 in the expansion of (x - y)12 ?

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab