Friday
December 13, 2013

Posts by Wayne

Total # Posts: 126

maths
not enough information

math
First thing I do is draw a picture. Sur Area of the four walls = 2 x (height of wall x width) + 2 x (height of wall x length), which yields: 108 = 2 x (h x 5) + 2 x (h x 4). So height = 6 meters

Maths
ab = 75 Archaic solution: only possibilities for ab are 01 through 99. Eliminate all of those not divisible by 5, which leaves: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55. 60, 65, 70, 75, 80, 85, 90, and 95. Eliminate those not divisible by 3 (divisibility rule for 3) , which l...

Math
Let x=length; 70-x = breadth (x + 15) =(3)*((70-x) - 5) x + 15 = 3 * (65 - x) x + 15 = 195 - 3x 4x = 180 x = 45 70 - x = 25

Geometry
SA(cyl)=(Circumference*height)+ Area of Top + Area of Bottom: SA = (pi*9*24)+ 2*(pi*4.5^2)

Algebra
solving for 7t^2-14t+10>1000, we get: 7t^2-14t-990>0 use quadratic equation to get: t> (7+ sqrt(6979))/7; thus: t> ~12.93 years

algebra1
solving for 7t^2-14t+10>1000, we get: 7t^2-14t-990>0 use quadratic equation to get: t> (7+ sqrt(6979))/7; thus: t> ~12.93 years

Math
His initial speed was 68mph. Using Distance = Rate * Time, we get: Let r = speed for 6 hours, r-20 = speed for 5 hours, so: 648 = 6r + 5*(r - 20). Hope this wasn't in Wi because the max legal speed limit is 65mph!

college algebra
I apologize! I misread your equation. Multiply through by x^2 gives: 9x^2-8x-2=0. Use Quadratic Formula to get two solutions: (8+sqrt(136))/18 and (8-sqrt(136))/18. I checked, and both work!

college algebra
multiply everything by x^2-9, which gives you: -5(x+3)-3(x-3)=2 Have fun!

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