This should be the correct answer,
4.5×10^9x + 0.00045x
Also, some good free calculators that can help with problems like this would be c y m a t h and m a t h w a y .
The first one is eight 4400-2400=2000 2000/250=8
Answer:
A. 
B. 
Step-by-step explanation:
Given

Required
Determine equivalent ratios:

First, we simplify the ratio to the least possible


By comparison with the given options, we have A and B as answer.
See Proof Below
Proof: A
Compare this to the simplified ratio (given), we have:
= 
Proof B

Simplify the ratio to the least possible


Compare this to the simplified ratio (given), we have:
= 
The decrease in the value of the toy is $9.25 if you subtract $ 0.75 from $10.00 then you get $9.25 so it's $9.25 cheaper
19.698 feet of cable would be needed, this would round up to 20 feet total.