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Damm [24]
3 years ago
8

Javier used chalk to draw some shapes on the playground.

Mathematics
1 answer:
Anna007 [38]3 years ago
6 0

Step-by-step explanation:

option D is answer coz parallelograms and rectangles have the angle greater than 90°……

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kelly subscribes to a service called mysongs for downloading music she pays a $7 fee each month to download an unlimited numbers
Nastasia [14]

subtract the fee from the total to get the amount actually spent on songs

23.80-7 = 16.80

 divide that amount by price per song to get number of songs downloaded

16.80 /0.20 = 84 songs

8 0
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
Solve these simultaneous equations 2x+3y=13 4x-y=-2
Neko [114]
X = 1/2 y = 4 by elimination

6 0
3 years ago
Read 2 more answers
What is the value of x in the equation ?StartFraction 2 Over 3 EndFraction left-parenthesis StartFraction one-half EndFraction.
Veronika [31]

Answer:

dont know sorry i wish i could help you use the internet

Step-by-step explanation:

4 0
3 years ago
What is the slope of the line represented by the equation y= x/6-5?
Alexxandr [17]
Slope of <span>y= x/6-5 = 1/6</span>
4 0
3 years ago
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