5(3x+7)=3(5x+7)
15x+35=15x+21
cancel out the 15x. If you bring over one of the 15x it's going to naturally cancel each other out.
35=21
35 does not equal 21
it would be the equal sign with the slash coming through it
F(x)=2ˣ
f(x)
(x,y)
(0,1)
(1,2)
(2,4)
(3,8)
(4,16)
(5,32)
(6,64)
(7,128)
(8,256)
(9,512)
(10,1024)
h(x)
(x,y)
(0,8)
(1,10)
(2,18)
(3,38)
(4,76)
(5,138)
(6,230)
(7,358)
(8,528)
(9,736)
(10,1018)
so somwehre between x=9 and x=10
hmm
f(9.5)=724.007
h(9.5)=874.875
go to 9.75
f(9.75)=944.609
h(9.75)=861.078
up
9.9
f(9.9)=955.426
h(9.9)=988.199
up
9.95
f(9.95)=989.119
h(9.95)=1003.02
up
9.99
f(9.99)=1016.93
h(9.99)=1014.99
a bit down
9.98
f(9.98)=1009.9
h(9.98)=1011.99
a bit up
9.985
f(9.985)=1013.41
h(9.985)=1013.49
pretty close, ya
so about at 9.985=x
if we graphed, we get that x=9.98512070914982..., so we are pretty close
You will need to use this formula:
<span>Years = {log(total) -log(Principal)} ÷ log(1 + rate)
Years = [log(15,000) - log(2,500)] / log (1.0525)
</span>
<span>
<span>
<span>
4.1760912591
</span>
</span>
</span>
-
<span>
<span>
<span>
3.3979400087
</span>
</span>
</span>
/
<span>
<span>
<span>
0.0222221045
</span>
</span>
</span>
=
<span>
<span>
<span>
0.7781512504
</span>
</span>
</span>
/ <span>
<span>
<span>
0.0222221045 =
</span></span></span>
<span>
<span>
<span>
35.0169917705
</span>
</span>
</span>
years
About 35 years
You'll find the formula here: http://www.1728.org/compint2.htm
And a compound interest calculator here: http://www.1728.org/compint.htm
(You'll find both are helpful for this problem).
