A student scores 74,87,68,63,76 on his last five exams. His teacher will drop the lowest grade to compute the student's average. What is the students average in the class ?

76.25

Average is the sum of numbers divided by the number of numbers

74 + 87 + 68 + 76 = 305

305 / 4 = 76.25

this doesn't make sense lol

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584