<span>b^4 − b^3 + b − 1
=(</span><span>b^4 − b^3) + (b − 1)
= b^3(b - 1) + (b - 1)
=(b - 1)(b^3 + 1)</span>
Answer:
C.
1/2
Step-by-step explanation:
To get the fraction of items that are not magnetic, subtract the fraction that stuck to the magnet (1/2) from 1 whole, or 2/2:
2/2 - 1/2 = 1/2
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Formula for slope: 
y₂: 6
y₁: 8
x₂: 1
x₁: -2
Plug them into the slope equation:

--> 
---> 
The slope is
.