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3 years ago

15

the table shows the relationship between the number of CDs and their cost at the flea market. Which equation shows the same rela

tionship?

1 answer:

Lemur [1.5K]3 years ago

3 0

Answer:

probably 2.5/d

Step-by-step explanation:

my mathematical teacher

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If f(x) = x - 5, then match each of the following.

stepladder [879]

Answer:

4

Step-by-6step explanation:

4-65

8 0

3 years ago

PLEASE FIND THE VERTEX OF THIS PARABOLA

yarga [219]

Given equation of the parabola y= -5x^2 -10x -13.

We need to apply formla for x-coordinate of the vertex.

x=-b/2a.

For the given equation we have a=-5 and b=-10.

Plugging values of a and b in formula of x-coordinate of the vertex.

x= -(-10)/2(-5)

x= 10/(-10) = -1.

So, we got x-coordinate of the vertex = -1.

Now, we need to plug x=-1 in given equation to find the y-coordinate of the vertex.

Plugging x=-1 in y= -5x^2 -10x -13, equation we get

y=-5(-1)^2-10(-1)-13.

y= -5(1) +10 -13.

y=-5 +10-13.

y=-18+10.

y=-8.

So, we got y-coordinate of the vertex -8.

Therefore, vertex of the parabola is (-1,-8).

3 0

3 years ago

A Square has the vertices at (-2,6) (6,1) (1,-7) (-7,-2). At what point do the diagonals of the square intercect

DerKrebs [107]

Answer: At point ( $-\frac{1}{2},-\frac{1}{2}$ )

Step-by-step explanation: <u>Diagonal</u> is a line uniting two opposite points. In a square, the diagonals intersect in a 90° and bisect each other, i.e., divides each diagonal into two segments of the same length.

In other words, the diagonals of a square meet at their midpoint, which is found as the following:

(x,y) = $(\frac{x_{1}+x_{2}}{2} ,\frac{y_{1}+y_{2}}{2})$

The opposite vertices of the given square are (-2,6) and (1,-7).

So, the intersection is

(x,y) = $(\frac{-2+1}{2} ,\frac{6-7}{2})$

(x,y) = $(-\frac{1}{2},-\frac{1}{2} )$

The diagonals of square with vertices (-2,6)(6,1)(1,-7)(-7,-2) intersect at point $(-\frac{1}{2},-\frac{1}{2} )$ .

4 0

3 years ago

PLEASE HELP! QUICK 20 MINS UNTIL CLASS IS OVER

musickatia [10]

Answer:

15x + 20

Step-by-step explanation:

6 0

3 years ago

Find the value of x from this adjoining figure

Fiesta28 [93]

Answer:

$x=15^\circ$

Step-by-step explanation:

Please refer to the attached figure for labeling of given diagram:

We are given the following angles:

$\angle AOC = 3x^\circ\\\angle BOD = 2x^\circ\\\angle EOF = 7x^\circ$

Angles opposite to each other when they are formed by crossing of two lines are known as vertically opposite angles. And vertically opposite angles are always equal to each other.

Using property of vertically opposite angles:

$\angle EOF = \angle AOB = 7x^\circ$

Line CD is a straight line, so $\angle COD = 180^\circ$

Also,

$\angle COD = \angle COA+\angle AOB+\angle BOD = 180^\circ\\\Rightarrow 3x + 7x + 2x=180^\circ\\\Rightarrow 12x =180^\circ\\\Rightarrow x = \dfrac{180}{12}\\\Rightarrow x = 15^\circ$

Hence, <em>answer</em> is $x = 15^\circ$ .

5 0

3 years ago