Thursday
December 5, 2013

# Posts by Francesca

Total # Posts: 155

Discrete Math
So, if A = (1, 2, 3) and B = (4, 5, 6) f: A -> B => {(1, 4), (2, 5), (3, 6)} g: B ->A => {(4,1), (5,2), (3,6)} g ° f = {(4,4), (5,5), (6,6), so g ° f = B right? And the domain and range are equal. But I'm still sure how it is defined? When finding the c...

Discrete Math
So, if A = (2,4,6) and B = (21,42,52) g : B -> A, wouldn't g = {(21,2), (42,4),(52,6)}? Is g ° f defined because it is one-to-one?

Discrete Math
Can you give an example using numbers?

Discrete Math
f: A→B, g :B→A Is g ° f defined? If so, what is its domain and range? Any suggestions?

Physics
Figured this one out already had to use the equation: x = v₀x√(2h/g)

Physics
An archer shoots an arrow horizontally at a target 14 m away. The arrow is aimed directly at the center of the target, but it hits 59 cm lower. What was the initial speed of the arrow? So, I am trying to find find v₀x. . .

Discrete Math
Also thank you for the time you took out to help me :)

Discrete Math
Oh okay we posted at the same time. . .You were such a big help! I really understand this stuff a lot better. Thank you a thousands times!

Discrete Math
How about this? Let f: A→B be a function from A to B. f = {(w, 1), (x, 2), (y, 3), (z, 2)}. Find f^-1. Answer: f^-1 = {(1, w), (2, x), (3, y), (2, z)} So would this one not have an inverse?

Discrete Math
Hey, I know I said the previous would be the last one but can you check this one too. . . Let f: A→B be a function from A to B. f = {(w, 1), (x, 2), (y, 3), (z, 2)}. Find f^-1. Answer: f^-1 = {(1, w), (2, x), (3, y), (2, z)}

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