Tomorrow, mrs. wendel's class will be using toothpicks for a science project.  each student must use at least 9 toothpicks for the project.  mrs. wendel knows that there is already a bag of 50 toothpicks in the class storage room.  she plans to buy  x  additional toothpicks this afternoon to make sure her class will have enough. if her class has  30 students, which number sentence represents this situation?

1)  Each student must use at least 9 toothpicks for the project and her class has 30 students, so

at least 9*30 toothpicks are needed.

2)  Mrs. Wendel has already 50 toothpicks,

so she needs to buy at least (9*30 - 50).

x ≥ 9*30 - 50

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x