10/12= $.83 per inch
20/18= $1.11 per inch
Answer:

Step-by-step explanation:
In order to add or subtract numbers in scientific notation, the powers of ten must have the same exponent. In this caes the diameter of an average human body cell is a power of -4 and the diameter of a plant cell is a power of -3. In order to add them, we can move the decimal over for the body cell diameter:

Add the two values: 
Answer:
x = 32
Step-by-step explanation:
Answer:
A is the answer you have to multiply them by 8 and you get a as an answer.....
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Step-by-step explanation: