Create an expression without parentheses that is equivalent to 4 (6x+x).

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

What is the total surface area of this square pyramid?

The number of calories you burn depends on your weight. a 110-pound person burns 163 calories during 30 minutes of tennis. find the number of calories that a 190-pound person would burn during the same activity, assuming they burn calories at the same rate.