Answer:

Step-by-step explanation:
A suitable common denominator is 4k^2. (This eliminates the first and last choices.)

It is B.
You see that the line segment crosses the y-axis at 1? That is known as the y intercept.
Remember y = mx + b?
Well in this graph, b = 1
Therefore it is B
Answer:
Yes it is true and 4 mark not ture
Step-by-step explanation:
Number of strings =

= 21 x 21 x 21 x 21 x 21 x 5 = 20 420 505
Answer: 20 420 505