jeanne

X¹² /   X⁹  using quotient property equals  X^12-9

X^{3 =}  216

216 ^1/3  = 6

X=6

never mind. I had  the question wrong...

3125/10,000

Start with  x+y =30,000

so x=30,000-y     we will come back to this

.06x+.12y= 2,460

.06(30,000-y)+.12y =2,460

 multiply

1800 - .06y+.12y =2,460

combine ys

1800 +.06y = 2,460 

.06y = 660   (subtracting 1800 from both sides)

   y=11,000

Back to the orginal

x+11000 = 30,000

x=19,000

why do you add 9 to both sides?

sorry I just saw that i used 95 not 90

the answer is 

3.5 X= 132-90

3.5X = 42

divide by 3.5

X=12 

one year

3.5X =132-95

3.5X=37

divide both sides by 3.5

x=10.57

approximate 10 1/2 months

sorry I just saw that i used 95 not 90

the answer is 

3.5 X= 132-90

3.5X = 42

divide by 3.5

X=12 

one year

+2-12

+3-13

and so on

x/3 =12

multiply both sides by 3

x=36