Wednesday
December 4, 2013

# Posts by FredR

Total # Posts: 108

Math 157
# of ways of selecting winning quintuple = permutations of 5 objects = 5! = 5 x 4 x 3 x 2 x 1 probability of winning = n!/(r!(n-r)!) = 44!/(5!39!)

math
x = original # of tickets y = original price you have 2 equations: xy = 180 (x-2)(y+9)=180+36 substitute equation 1 into 2 and solve.

math
16-15.2 = 0.8 0.8/0.03 = n = 26 standard deviations so, erf(n/sqrt(2)) = approximately 1 so, 50% of the data would be between 15.2 and 16.

calculus
The formulas given look like they are for sinusoids and not circles.

Maths
the graph of y=sin(theta) is moved vertically along the y axis a distance of q to obtain y=sin(theta)+q.

math
= (y/3)(y^2+5y+6) = (y/3)(y+2)(y+3)

Algebra
= (18+4)r^2 +7s = 22r^2+7s

math
for example, for x = 2, y = 0 x = 3, y = -1/3 x = 4, y = -2/3 x = 5, y = -1

math
A = amt invested at 8.5% B = amt invested at 10% A + B = 50000 or A = 50000 - B income = 0.085A + 0.10B = 4700 substitute A in terms of B and solve

Algebra II
c = # of chest freezers u = # of upright freezers c+u>=100 or u >= 100-c assume a total of 100 units cost = 250c + 400u = 250c +400(100-c) = 250c + 40000 - 400c = 40000 - 150c = 800 - 3c so obviously the more type c units, the lower the total cost. profit = 40c + 60u >...

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