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• Yesterday, 05:54 PM
10 * 2^x - 8 * 5^(x-2) = 0 10 * 2^x = 8 * 5^(x-2) = 0 2^x / 5^(x-2) = 8 / 10 Carry on...(remember that 5^(x-2) = 5^x / 5^2)
9 replies | 140 view(s)
• Yesterday, 12:20 PM
Your equations: (x-2)^2 + (y-3)^2 = 6 y = -2x^2 + 14x - 1 Simplify and rearrange: x^2 - 4x + y^2 - 6y = -7 -2x^2 + 14x - y = 1 Now...
2 replies | 78 view(s)
• 05-18-2018, 05:01 PM
Ain't even a "guessed right": it's more "luckily matching the silly lecturer's intent"! Wether that stupid interest rate compounds only once per...
11 replies | 301 view(s)
• 05-18-2018, 09:22 AM
com-ple-ment noun 1. something that completes or makes perfect: A good wine is a complement to a good meal. 2. the quantity or amount...
7 replies | 152 view(s)
• 05-18-2018, 09:18 AM
Agree! However, the "exam" was over, and the "class" was kinda fooling around with this...so was simply trying "to be nice" :rolleyes:
7 replies | 152 view(s)
• 05-18-2018, 09:12 AM
Are you sure that's not x^2 + 2x - 8 = 0? Then x = 2 or -4
3 replies | 104 view(s)
• 05-18-2018, 08:55 AM
2 replies | 108 view(s)
• 05-17-2018, 07:35 PM
Problem can be worded this way: prove that all numbers ending with 1,3,7 or 9 to the power 4 end with 1. 1^4 = 1 3^4 = 81 7^4 = 2401 9^4 = 6561...
7 replies | 152 view(s)
• 05-17-2018, 12:39 PM
Oh boy...ok ok...I'll go stand in the corner...
12 replies | 330 view(s)
• 05-17-2018, 11:36 AM
My 74,245 assumed 5% APR cpd monthly, your friend's 73,557 assumes 5% effective: she knows what she's doing! :rolleyes: However, the difference is...
11 replies | 301 view(s)
• 05-17-2018, 11:04 AM
w = I + G, y = Y :rolleyes: Your initial equation: y = u + v − vty + w re-arranged: y + vty - v = u + w So we have: y(tv + 1) - v = u + w or:...
6 replies | 124 view(s)
• 05-17-2018, 09:08 AM
Where did the Z go?! Plus you're showing 2 equal signs... Please repost the original equation PROPERLY. Also, use u instead of c 0 and v instead...
6 replies | 124 view(s)
• 05-16-2018, 07:14 PM
Well, if that problem was made up by your lecturer, then your lecturer should be fired! :rolleyes: All there is that can be calculated is the...
11 replies | 301 view(s)
• 05-16-2018, 04:28 PM
Another way: m = Mark's original speed, v = minutes at original speed. @m.................................>v min ...
4 replies | 150 view(s)
• 05-16-2018, 01:22 PM
Remove the 1200 part: water bill for \$2.88, representing .40 per hundred cubic feet; how many cubic feet? 2.88 / .40 * 100 = 720 Over and out!
12 replies | 330 view(s)
• 05-14-2018, 10:34 PM
1
2 replies | 134 view(s)
• 05-13-2018, 09:17 AM
WHY are you asking that question? Makes no sense... Look at it this way: @3mph...........d............>@6mph...........d.............>total of...
30 replies | 1061 view(s)
• 05-12-2018, 09:44 PM
Methinks this can be solved pretty much directly; 1 solution only. Draw perpendicular CH (H on AB); let h = CH. We now have 2 right triangles:...
4 replies | 222 view(s)
• 05-11-2018, 04:44 PM
Please post the original problem IN FULL... What you posted is useless.
4 replies | 203 view(s)
• 05-11-2018, 04:38 PM
Darn it Al, just solve this for d: d/3 + d/6 = 1/2 1st step: multiply the equation by 6
30 replies | 1061 view(s)
• 05-11-2018, 10:06 AM
d = distance d/3 + d/6 = 1/2 : 30 min = 1/2 hr Solve for d
30 replies | 1061 view(s)
• 05-09-2018, 07:11 PM
Huh? WHO are you addressing? soccergirl (whoever she is)???
4 replies | 370 view(s)
• 05-09-2018, 02:10 PM
11 replies | 353 view(s)
• 05-08-2018, 02:01 PM
Using a and b for speeds, u and v for hours; hr = hours: 0 hr(@a kmh)....................................>(u+v) hr u hr(@b...
7 replies | 318 view(s)
• 05-06-2018, 06:20 PM
I can't follow what you're doing... GIVEN: r = .055, a = 125000, p = 710 n = total number of months = ? i = r/12 (monthly rate) p = ai / :...
2 replies | 152 view(s)
• 05-06-2018, 01:22 PM
u = x+3, v = 2x-3 a = 2/u, b = ?, c = 2/v b = (a + c) / 2 = (2/u + 2/v) / 2 = (u + v) / (u*v) = same as Halls! Some "cutish" examples (x: a,...
5 replies | 297 view(s)
• 05-05-2018, 03:37 PM
Denis replied to a thread math software in News
Carloyn, why are you reviving old threads?
2 replies | 3070 view(s)
• 05-04-2018, 04:27 PM
Denis replied to a thread What is the sum? in Math Odds & Ends
Yaaaa...true...I still fall off the potty :(
8 replies | 257 view(s)
• 05-04-2018, 04:24 PM
You got 3 problems in that mess. Suggestion: post each separately (after turning the Caps Lock off!). show your work on each.
7 replies | 380 view(s)
• 05-04-2018, 04:13 PM
7 replies | 434 view(s)
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