How to rationalize the denominator that is a radical.

The table shows the distance traveled over time while traveling at a constant speed.

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?

In the diagram below,abc is congruent to dec what is the value of x