SOLUTION: I'm stuck on a couple of questions. 1.) I = E/R + r Solve for r I can't seem to comprehend the formula to use to solve. 2.) 3/2y

SOLUTION: I'm stuck on a couple of questions. 1.) I = E/R + r Solve for r I can't seem to comprehend the formula to use to solve. 2.) 3/2y - 3/2y+4 Reduce the answer to lowest

Question 52837: I'm stuck on a couple of questions.
1.) I = E/R + r Solve for r
I can't seem to comprehend the formula to use to solve.
2.) 3/2y - 3/2y+4 Reduce the answer to lowest terms.
3.) X^-3 = 8 Solve the equation.
Any help and guidance of the formulas and steps involved would be appreciated.
Found 2 solutions by Earlsdon, funmath:
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
1) Solve for r:
Subtract from both sides of the equation.
or This could also be written:

2) Reduce to lowest terms:
A common denominator is
Simplifying this.
Simplifying further.
Cancel the 4's
or
3)Solve:
Rewrite as:
Multiply both sides by
Divide both sides by 8.
Take the cube root of both sides.
or
Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!
1.) I=E/R+r
I-E/R=-E/R+E/R+r
I-E/R=r
2.) 3/2y-3/2y+4
(3/2-3/2)y+4
0+4
4
3.) I'm going to show you this two ways because I don't know what level of math you're taking. Do whatever makes sense to you.
x^-3=8
1/(x^3)=8
(x^3)(1/(x^3))=(8)(x^3)
1=8x^3
1/8=8x^3/8
1/8=x^3
3root(1/8)=3root(x^3)
1/2=x
________________________________

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