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Anuta_ua [19.1K]
2 years ago
13

Justin is considering two websites for downloading music.The costs are detailed here.

Mathematics
1 answer:
djverab [1.8K]2 years ago
4 0
Website 1. y=1.50x+30.
website 2. y=2
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Which quadratic function in vertex form can be represented by the graph that has a vertex at (3, -7) and passes through the poin
yarga [219]

~~~~~~\textit{vertical parabola vertex form} \\\\ y=a(x- h)^2+ k\qquad \begin{cases} \stackrel{vertex}{(h,k)}\\\\ \stackrel{"a"~is~negative}{op ens~\cap}\qquad \stackrel{"a"~is~positive}{op ens~\cup} \end{cases} \\\\[-0.35em] ~\dotfill

\begin{cases} h=3\\ k=-7 \end{cases}\implies y=a(x-3)^2-7\qquad \textit{we also know that} \begin{cases} x=1\\ y=-10 \end{cases} \\\\\\ -10=a(1-3)^2-7\implies -3=a(-2)^2\implies -3=4a\implies -\cfrac{3}{4}=a \\\\[-0.35em] ~\dotfill\\\\ ~\hfill y=-\cfrac{3}{4}(x-3)^2-7~\hfill

5 0
1 year ago
I need help with these two questions please!!!please HeLp mE
Hatshy [7]

Answer:

5, 2, 1, 2, 3

Step-by-step explanation:

5 0
3 years ago
Whats the inequality in the graph?
Kazeer [188]

Answer:

y=2x-5

Step-by-step explanation:

Slope is rise over run, or y/x

The points given were (0,-5) and (-1,-3)

Using y2-y1/x2-x1 we can find the slope.

-3-(-5)/-1-0 = 2/-1 = -2 = slope

Next, we have to find the y-intercept. The y-intercept is where the point on the line meets the y-axis.

This point is shown at -5.

Now, putting our information into y=mx+b (slope-intercept form)

y=2x-5

2 is our slope

-5 is our y intercept

6 0
3 years ago
A combination of which different minerals forms what object?
Mashutka [201]

Answer:

oxide, sulfide, sulfate, and carbonate groups.

Step-by-step explanation:

4 0
3 years ago
the radius of a cylinder is 3.5ft. The height is 14ft. Find the surface area and volume of the cylinder to the nearest tenth of
grandymaker [24]
The surface area of a cylinder is the sum of the top + bottom + body, right?
The top and the bottom are circles with the same radius 3.5 . And we know that the area of a circle is r^2pi, (don't forget we have 2 circle, so, the answer must be multiplied by 2)
Now, the body: the body is just a rectangular with the width is the height of the cylinder and the length is the circumference of the circle. 
The circumference = 2 r pi
the height is given
All you need to do is to calculate them and add them up. You need to work out to get the answer. 
8 0
3 years ago
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