DS 71 Questions from Students

# DS 71 Questions from Students - Quiz#1 Problem#10 v2 11v 28...

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Quiz #1, Problem #10 v 2 + 11v + 28 0 (v+7)(v+4) 0 - 7 - 4 0 Plug 0 into the factored inequality above. Since (7)(4) = 28 which is 0, the answer(s) are on both ends: (- , -7] or [-4,

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Quiz #1, Problem #6 C(x) = 200 + 90x Average cost = 110 10 ) 10 ( 90 200 ) ( = + = x x C
Quiz #1, Problem #5 Let (-5,6) be (x 1 ,y 1 ) Let (0,2) be (x 2 ,y 2 ) Then 5 4 ) 5 ( 0 6 2 = = m y - y 1 = m(x - x 1 ) y – 6 = 5 4 (x – (-5)) 5y – 30 = -4x – 20 -4x – 5y = 10

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Quiz #2, Problem #1 c(x) = 25,000 + 1.18x
Quiz #2, Problem #2 \$5.97

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Quiz #2, Problem #5 P = -x 2 + 66x + 80 gives a = -1 b = 66 c = 80 h = 33 ) 1 ( 2 66 2 = = a b
Quiz #2, Problem #6 C = 3x 2 - 162x + 88 gives a = 3 b = -162 c = 88 h = 27 ) 3 ( 2 ) 162 ( 2 = = a b

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Quiz #2, Problem #10 36 3 1 3 1 2 2 + = q q 36 3 2 2 = q 54 2 = q 7 348 . 7 54 = = q
Quiz 4, Problem #2 How much must Harry's Hardware deposit at interest for in order to earn interest? I = P r t 900 = P (.155) 365 120 P = 17,661.29

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Quiz 4, Problem #4 Leon Harding receives proceeds of \$6,839 after signing a 91-day note for \$7,100. Find the discount rate. D = Art 7,100 – 6,839 = 7,100 r 365 90 261 = 7,100 r 365 90 0.036761 = r 365 90 r = 14.9%
Quiz 4, Problem #5 A small company borrows at compounded monthly. The loan is due in How much interest will the company pay? If you are the one who asked this question, you were

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DS 71 Questions from Students - Quiz#1 Problem#10 v2 11v 28...

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