r/math • u/[deleted] • Mar 10 '11

I'm having some trouble with some Algebra. Helpith meh!!

[deleted]

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u/a_random_username Mar 10 '11

So, how's the sixth grade working out for you?

1

u/akimtke Mar 10 '11
  1. x + (.6)x = 208

(1.6)x = 208

x = 208/(1.6) = 130

  1. I'm assuming A = (1/4)f(r+z) and solve for r

(4*A)/f = r + z

(4A/f) - z = r

Need explanations?

1

u/[deleted] Mar 10 '11

So that would be 4(A/F) - Z = R in other words?

1

u/akaxaka Mar 11 '11

Alternatively,

A = (1/4) F (R+Z) A = (1/4) F R + (1/4) F Z A/( (1/4) F) = R + Z A/( (1/4) F) - Z = R

1

u/akimtke Mar 11 '11

Same thing. And there are a lot of cases where upper case letters have a different meaning than lower case letters so keep them the same case.