The pear company sells pphones. the cost to manufacture
x
pphones is
c
(
x
)
=
−
30
x
2
+
69000
x
+
19438
dollars (this includes overhead costs and production costs for each pphone). if the company sells
x
pphones for the maximum price they can fetch, the revenue function will be
r
(
x
)
=
−
39
x
2
+
321000
x
dollars.

how many pphones should the pear company produce and sell to maximimze profit? (remember that profit=revenue-cost.)

x=

2.12 school absences. data collected at elementary schools in dekalb county, ga suggest that each year roughly 25% of students miss exactly one day of school, 15% miss 2 days, and 28% miss 3 or more days due to sickness.61 (a) what is the probability that a student chosen at random doesn’t miss any days of school due to sickness this year? (b) what is the probability that a student chosen at random misses no more than one day? (c) what is the probability that a student chosen at random misses at least one day? (d) if a parent has two kids at a dekalb county elementary school, what is the probability that neither kid will miss any school? note any assumption you must make to answer this question. (e) if a parent has two kids at a dekalb county elementary school, what is the probability that both kids will miss some school, i.e. at least one day? note any assumption you make.