Driving from chester to boxerville, you see a sign that says you have seven miles to go. if the total length of the trip is 45 miles, how many miles have you already traveled? what is the unknown quantity in the example?

For the first part,



The unknown quantity was the distance you had already traveled.

Do you understand this? Or should I explain more explicitly?

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post