Assuming the number is 331/2, or 331 over 2:
331/2 = 165.5 ÷ 400 = .4138 x 100% = 41.38%
100% - 41.38% = 58.62% not nickels
If the number is 33 1/2, or 33 and one half
33 1/2 = 67.5 ÷ 400 = 0.0838 x 100% = 8.38%
100% - 8.38% = 91.62% not nickels
Answer: 
Step-by-step explanation:
By definition, negative numbers, positive numbers and zero are Integers.
It is important to remember the multiplication of signs:
You can observe that you must multiply two integers, one of them is negative and the other one is positive. The product will be an integer. Then:
Since any Integer can be written as a fraction, you can rewrite the product by writing 
as the numerator and 
as the denominator.
Then, this is:
Answer:
B
Step-by-step explanation:
Start by using the distance formula to find the raidus
The two points are (-2,1) and (-4,1)
√((-4+2)²+(1-1)²)= 2
The radius is two and we have our center which means we can write
(x+2)²+(y-1)²=4
now it's just a matter of expanding everyhting
x²+4x+4+y²-2y-3=0
x²+y²+4x-2y+1=0
This is equal to B
If the length of the real airplane is 38 then 19x2 is 38, so 18x2 36. therefore you answer is 36
7 is right, and 8 is a square because all the sides are the same size (you can count the units, or do the calculation)
