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In one​ class, homework is worth 50​% of the final​ grade, each of 3 projects is worth 10​%, and a final exam is worth 20​%.
​(a) If a student has an 88 homework average and a 94 on the first​ project, what is the​ student's grade at this​ point?
​(b) If the same student from part​ (a) gets a 76 on the second project and a 74 on the third​ project, what is the lowest grade the student can get on the final exam to get an 80 overall in the​ course?
( for the first anwer it k

Sagot :

Answer:

(a) .5(88) + .1(94) = 53.4

(b) .5(88) + .1(94 + 76 + 74) + .2x = 80

44 + .1(244) + .2x = 80

44 + 24.4 + .2x = 80

68.4 + .2x = 80

.2x = 11.6

x = 58

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