Answer:
14
Step-by-step explanation:
To evaluate the value of the expression when you should substitute 2 instead of e into expression. Then you will get the expression
Since
this expression becomes
No answers at all! (C) 2x-5y cannot equal two things at once.
Answer:
D: 1600cm^2
Step-by-step explanation:
Answer:
72 sheets
Step-by-step explanation:
We can use the proportion: <em></em>.
Cross-multiplication shows us that <em>5x = 360</em>.
This means that x = 72 sheets.
(There are simpler methods, but this is the most easily explainable)
- I’m assuming the expression implies the following:
(1-n)/(n^2 - 1)
The steps goes as follows:
= -(n-1)/(n^2-1) (factored a negative out)
= -(n-1)/[(n+1)(n-1)] (Factored denominator into a difference of squares, but don’t just blindly accept the fact, expand it and you should get the original denominator)
At this point, the (n-1) terms cancel, as you should know: a real number, besides 0, over itself is 1.
= -1/(n+1) , which is the answer
Note: You could also see it as 1/-(n+1) or 1/(-n-1)