Answer:

Step-by-step explanation:

Use commutative property of addition 

use associative property of addition 

Hence 
The variable of interest would be whether or not their eyes were affected.
Variables of interest are like independent variables, they are the variable that you are testing for change.
Answer: 15 + 53/77
Step-by-step explanation:
Multiplying a fraction by 1 does not change the value.
Any number divided by itself is 1.
For instance, 11/11 = 7/7 = 1.
12 + 1/7 + 3 + 6/11 = 15 + 1/7 + 6/11
= 15 + (11×1)/(11×7) + (7×6)/(7×11)
= 15 + 11/77 + (6×7)/77
= 15 + (11 + 6×7)/77
= 15 + 53/77
It is faster to make sure to multiply by the "smallest" form of one that will work, but you don't have to. You only need to make sure that at the end there are no common factors in numerator and denominator, and that numerator is smaller than denominator.
Answer:
12dollars
Step-by-step explanation:
so to figure sells tax of 6percent on every dollar you take amount spent say take 20 ×.06 now . 06 is 6percent equals 1.2 so a dollar 20 cents is added to 20 making 21.20 so to find original price you always to opposite of the equation so if sells tax . 72 divide it by .06 and you get 12