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pentagon [3]
3 years ago
13

Y 9 <12x + 141 true?

Mathematics
1 answer:
lesya692 [45]3 years ago
4 0
Yes it is true if you need me to explain lmk
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For each function below, determine whether or not the function is injective and whether or not the function is surjective. (You
Harlamova29_29 [7]

Answer: First, injective means that for every y, there is only one x such f(x) = y, and surjective means that if f is a function that goes from the set {x} to the set {y}, for every element y in the codomain there is at least one element x in the domain such f(x) = y

(a) f:R----> + R given by f(x) = x2 (i guess you written x^{2})

The function is not injective, because f(-2) = f(2), and is surjective, because the codomain is +R, and x^{2} is always a positive real number.

(b) f:N----> + N given by f(n) = n2  (i guess you written n^{2})

As the naturals have no negative numbers, in this case the function is injective, but isn't surjective, because there is no number that when squared is equal to 5, for example.

(c) f: Zx Z → Z given by f(n, k) = n +k:

here the domain is of the form (n,k) and the function is n +k, so the numbers (z,w) and (w,z) return the same value when evaluated in f, then f is not injective. And is easy to see that f is surjective, because in the sum you can reach al the integers on the codomain.

3 0
3 years ago
Find the area <br> Plz help
Katena32 [7]

To calculate the area of a triangle, multiply the base and the height, then divide the product by 2.

7*8=56

56/2=28

Area=28 feet squared

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3 years ago
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Ninety-eight and seventy-three hundredths which place are tens , ones , tenths , hundredths?
Naily [24]
8 is the hundreds, 7 in the tens, and 3 in the ones
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A bakery sells 8 muffins for every 6 bread rolls. They sell 640 muffins in one week, how many rolls did they sell? USE SCALAR MU
olasank [31]
640 Diveded by 8 = 80 and 80 diveded by 6 = 13 R2

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3 years ago
Plz help ASAP!!!! I NEED IT!!!!!If you don't know the answer plz don't use an answer to say "oh idk" or sum like that
Monica [59]

Answer:

I wanna say the first picture second answer choice. Please tell me if I am right.

Step-by-step explanation:

7 0
3 years ago
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