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Deffense [45]
3 years ago
11

Eric is buying a DvD that costs 19.83. He has to pay 7% sales tax. How much will the sales tax be ?

Mathematics
2 answers:
gregori [183]3 years ago
7 0
19.83 x 1.07 = <span>21.218
$21.22</span>
Tema [17]3 years ago
4 0
$1.39 hope this helps!
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Which of these equations represent functions? Check all that apply.
AVprozaik [17]
A is quadratic function
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3 years ago
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
A line passes through 2, -1 and 4, 5 what is the equation
SVEN [57.7K]

y1 - y2 / x1 - x2

-1 - 5 / 2 - 4

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3

y = mx + b

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Hope this helps! ;)

8 0
3 years ago
Read 2 more answers
Will give brainlest :)
snow_lady [41]

Answer:

C)

Step-by-step explanation:

4 0
2 years ago
A gardener is transplanting flowers into a flowerbed. She has been working for an hour and has transplanted 14 flowers. She has
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Answer:

She needs another 2 and a half hours, so <em><u>2.5 is your answer</u></em>

Step-by-step explanation:

3 0
3 years ago
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