Malik earned $2,344.55 fixing computers. He charged $35.50 per hour. Which expression does NOT use appropriate compatible numbers to estimate the total number of hours he worked?
A. 2,400 ÷ 30
B. 2,400 ÷ 40
C. 2,000 ÷ 40
D. 2,000 ÷ 30

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?