For number 2 it's would be 12.8
Sorry I don't have time for number 3
Answer:
Easy!
Step-by-step explanation:
1) To find the surface area of a regular triangular pyramid, we use the formula SA = A + (3/2)bh, where A = the area of the pyramid's base, b = the base of one of the faces, and h = height of one of the faces.
or
2)Multiply the side length of the base by the slant height and divide by two. Then, multiply by 4. This will give you the lateral surface area of the pyramid. Add the base surface area and the lateral surface area.
Answer:
3 and 2
Step-by-step explanation:
3 x 2 = 6
3 + 2 = 5
5% fail
so 100-5=95% are left
percent means parts out of 100
95% of 100 is

times 100=95
95 students are left assuming that the 5% that fail fail within 12 months