Dave has a rectangular yard that is 50 ft x 40 ft. He built a triangular garden that has a base of 15 ft and a height of 16 ft. If the rest of the yard is covered in grass, how much area of grass is in the yard?

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?