This is not a function. There are multiple outputs for the same input at 
. A function only has 1 output for every input.
STU + STR = 180
8x + STR = 180 [ STU = 8x ]
STR = 180 - 8x
STR = SRT [ RS ≈ ST ]
Now, In ΔSRT,
we have, RST = 7x - 54, STR = SRT = 180-8x
Their sum is 180, as it constitutes a triangle.
7x-54 + 2(180-8x) = 180
7x - 54 + 360 - 16x = 180
306 - 9x = 180
9x = 306 - 180
9x = 306 - 180
x = 126/9
x = 14
So, option A is your answer.
Hope this helps!
Yes it correct.............
You will have to use this formula:
<span>log(1 + rate) = {log(total) -log(Principal)} ÷ Years
</span>log(1 + rate) = {log(100,000) -log(21,600)} <span>÷ </span><span>Years
</span>log(1 + rate) = { 5 -4.3344537512} / Years
log(1 + rate) =
<span>
<span>
<span>
{ 0.6655462488} / 42
</span></span></span>log(1 + rate) =
<span>
<span>
<span>
0.0158463393
</span>
</span>
</span>
1 + rate = 10^<span>
<span>
0.015846339
</span></span><span>1 + rate = </span>1.0371613856
rate = .0371613856<span>
rate = </span><span>3.71613856%
</span>************************************************************************
Double-Check
Total = principal * (1 +rate)^years
Total = 21,600 * (<span>1.0371613856)^42
</span>
<span>Total = 21,600 * </span>
<span>
<span>
<span>
4.6296296291
</span>
</span>
</span>
<span><span>
</span>
</span>
Total = 100,000
Correct !!
