SOLUTION: -15 < -5(s - 5)<_ 30 Please select the correct answer: [-1.8) (-oo.-1] (8. oo) (-1.8]

Algebra ->  Algebra  -> Inequalities -> SOLUTION: -15 < -5(s - 5)<_ 30 Please select the correct answer: [-1.8) (-oo.-1] (8. oo) (-1.8]      Log On

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Question 41127: -15 < -5(s - 5)<_ 30
Please select the correct answer:
[-1.8)
(-oo.-1]
(8. oo)
(-1.8]
Answer by josmiceli(6784) About Me  (Show Source):
You can put this solution on YOUR website!
-15+%3C+-5%28s+-+5%29%3C=+30
Multiply each term by -1 and reverse the inequality signs
15+%3E+5%28s+-+5%29+%3E=+-30
divide through by 5
3+%3E+s+-+5+%3E=+-6
8+%3E+s+%3E=+-1 answer
check some values. Let s = 7
-15+%3C+-5%28s+-+5%29+%3C=+30
-15+%3C+-5%287+-+5%29+%3C=+30
-15+%3C+-10+%3C=+30 TRUE
Let s = -1
-15+%3C+-5%28-1+-+5%29+%3C=+30
-15+%3C+30+%3C=+30 TRUE