How many pounds of $2.4/lb trail mix should a grocer combine with 5 lb of $1.5/lb trail mix to get $1.9/lb trail mix?

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

What is the answer to this equation? and if you can, find a way to show your work.