There are 580 students at Alejandro’s school. He surveys a random sample of 60 students and finds that 21 of them regularly bring their lunch. Based on these results, estimate how many students at Alejandro’s school regularly bring their lunch.

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.

What’s the volume of the triangular prism?