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ohnonotmath:

0.30 = 0.15 (1) - (1 - 0.15) x
0.30 = 0.15 - (0.85)x Thanks for that
0.15 = -0.85x
0.15/-0.85 = x
-0.176 = x Your answer is not exact - you have rounded it off to 3 dec places. It can be written as a recurring decimal but there would be a lot of digits recurring. If you want it exact it is better to present it as a fraction.
?

ohnonotmath:

It has been so long since my last math class I completely forgot how to do this. Solve for x
.30 = x(1) - (1 - x).15

I think...
.3 = x - (.15 - .15x)

ohnonotmath:

Okay
.30 = .15(1) - (1 - .15)x
.30 = .15 - (1 - .15)x good but you could have done 1-0.15=0.85 at the same time and then all the rest would have been easier.
.15 = -(x - .15x)
.15 = (x + .15x) can I do that with the signs? Not quite -(x-0.15x) = -x - - 0.15x => -x + 0.15x
When you multiply a bracket by a negative number, it changes the sign of ALL the terms inside the bracket
So from here down can't be quite right.
.15 = 1.15x
.15/1.15 = x
.13 = x
Is that right?

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Vaughn:

52 x 51 x 50 x 49 x 48 x 47 x 46 x 45 x 44 x 43 x 42 x 41 x 40 x 39 x 38 x 37 x 36 x 35 x 34 x 33 x 32 x 31 x 30 x 29 x 28 x 27 x 26 x 25 x 24 x 23 x 22 x 21 x 20 x 19 x 18 x 17 x 16 x 15 x 14 x 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1

twaal22:

What is 1+2+3+4+5....+401?

king:

solve(24^2+b^2=25^2, b)

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