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Andrews [41]
3 years ago
12

Which describes the graph of f(x)=[x]-2 on [0,3) 50 points to you

Mathematics
1 answer:
butalik [34]3 years ago
7 0

Answer:

The first choice is the one you want

Step-by-step explanation:

First thing you need to know about this greatest integer graph is that it is aptly called a step graph.  It literally looks like stair steps on your calculator: short horizontal lines that are not connected vertically.  Really cool graph.

Second thing you need to know is about transformations of functions.  ANY side-to-side movement in ANY function will be in a set of parenthesis (or absolute value symbols, or under a radical sign, or inside the greatest integer brackets, etc.) and ANY up or down movement will be either added or subtracted.  Added means you move the function up from its starting position, subtracting means you move the function down from its starting position.  Since we have no numbers inside the greatest integer brackets, there is no side-to-side movement.  Since there is a "-2" after the brackets, we are moving the whole function down.

If you do not know how to graph these without a calculator and you have no idea what this graph looks like, I recommend going to your calculator to see it.  First, call up your "y = " window.  Next, hit 2nd-->0 (catalog), then hit the x^2 button (this will take you to the letter I in the catalog).  Scroll down til you see "int( " and hit that button.  It will take you back to the "y = " window.  Enter an x after that set of parenthesis and then close it, then hit " - 2 " and then "graph".  Your steps should begin to appear.  Notice that the horizontal line between x = 0 and x = 1 is at y = -2.  The parent graph has this line between x = 0 and x = 1 on y = 0.  The -2 in ours moved the graph down from y = 0 to y = -2

Summing up, the first choice is the one you want as your answer.

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X + 5y = 28 2x + 3y = 21 Solve for x and y.
snow_tiger [21]
First what we gonna do is solve for y.
x+5y=28 Subtract 5y both sides.
  -5y  -5y
x=-5y+28 Then you have to replace x with the equation.
2(-5y+28)+3y=21 Multiply.
-10y+56+3y=21 Combine like terms and subtract 56 both sides. 
       -56        -56
-7y=-35 Divide -7 both sides.
y=5 Simplify.
x=-5(5)+28 Multiply and add.
x=-25+28
x=3
Heres your answer x=3 and y=5.
6 0
3 years ago
6. Let A and B be nxn matrices . Compute (A + B) (A + B). Explain all steps.
Pie

Answer:

(A+B)(A+B)=A.A+B.A+A.B+B.B

Step-by-step explanation:

Given that matrices A and B are nxn matrices

We need to find (A+B)(A+B)

For understanding the multiplication of matrices let'take A is mxn and B is pxq matrices,we can multiple only when n=p,so our Ab matrices will be mxq.

We know that that in matrices AB is not equal to BA.

Now find  

(A+B)(A+B)=A.A+B.A+A.B+B.B

So from we can say that (A+B)(A+B) is not equal to A.A+2B.A+B.B because AB is not equal to BA in matrices.

So (A+B)(A+B)=A.A+B.A+A.B+B.B

4 0
3 years ago
45% of all 1st graders at Sierra Elementary School are female students. This year there are 54 female 1st graders at Sierra Elem
Anit [1.1K]

Answer:

There are 120 1st graders at Sierra Elementary School this year

Step-by-step explanation:

Let n represent the total number of 1st graders at Sierra Elementary School

Since 45% of all 1st graders at Sierra Elementary School are female students and this year there are 54 female 1st graders, 45% of n is equal to 54

→ n(\frac{45}{100}) = 54

→ 45n = 5400

→ n = 120

3 0
3 years ago
Read 2 more answers
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Sladkaya [172]

Answer:

Step-by-step explanation:

its not A

4 0
3 years ago
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8. Which function is shown on the graph below?
Dafna11 [192]

Answer:

the answer is c

Step-by-step explanation:

-then+

6 0
2 years ago
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