27
18
----
45
GCF of 45 = 15
Here is a word document on Greatest Common Factors and how to solve it.
Answer:
4+7x
Step-by-step explanation:
B. Sandwich costs $7.70 and the soda costs $2.20
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:
Step-by-step explanation:
y - 2 = 2/3(x - 6)
y - 2 = 2/3x - 4
y = 2/3x - 2