Shopping with an Engineer........!!!!

$$v_a - v_b = \frac{kQ}{r_a} - \frac{kQ}{r_b}$$

If this is what you wrote, then it's right. (I can't make out what that letter is you wrote where there needs to be Q.)

Cheers.

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-4/3x + 2/5x = 14/45         get the common denominator of 45 on the left

(-60/45)x + (18/45)x  = 14/45       multiply through by 45

-60x  + 18x   =  14         combine like terms

-42x   =  14               divide by -42 on both sides

x  =  14 / -42   =  -1 / 3

wow. no comment

Width of to after 5 minutes = 2*2*2*2*2*2 = 64 inches

press enter.....

Q: > Can anybody tell me what they think is the most important job that needs math is? Hint: so i can avoid that job.

A: IMHO, shopping!!

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$$66\frac{2}{3}%$$% of 96

$$=\frac{66\frac{2}{3}}{100}\times{96}$$

$$=\frac{2}{3}\times{96}$$

$$=64$$

alright i get it. Thanks fossil. Who knew i could learn something from an old person....How the times have changed

There was nothing to "solve"......remember........we have to have an " = "  sign in the problem to do that......I just  "simplified"  it using some basic rules involving exponents.....

So how did you solve it without knowing what the variables were?

I don't know, zegroes......it's just a variable.......and, since it's upper-case, we usually assume that it's different from the lower-case "b"......What  is  each suppposed to represent?????.......who knows????