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Gnesinka [82]
3 years ago
8

A Web music store offers two versions of a popular song. The size of the standard version is 2.9 megabytes (MB). The size of the

high-quality version is 4.7 MB. Yesterday, the high-quality version was downloaded four times as often as the standard version. The total size downloaded for the two versions was 6076 MB. How many downloads of the standard version were there?
Mathematics
1 answer:
Novosadov [1.4K]3 years ago
3 0
<span>There were 260 downloads of the HQ version</span>
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Help me please i’m struggling, u don’t have to explain
Rom4ik [11]
<h3>Answer:  10 cm  (choice A)</h3>

====================================================

Explanation:

One equation we could solve is

x/2.5 = 30/7.5

Note the x/2.5 has us dividing the vertical sides, while 30/7.5 is the same idea for the horizontal sides. The order is large over small. You could do small over large, but make sure you keep both sides consistent.

Solving for x leads to...

x/2.5 = 30/7.5

x*7.5 = 2.5*30

7.5x = 75

x = 75/7.5

x = 10  (choice A)

There are many other possible equations that lead to the same answer. One other possible equation is x/30 = 2.5/7.5

These proportions are possible due to the fact we have similar triangles.

7 0
3 years ago
Which of the following expressions is equal to -×^2-81?
Vsevolod [243]
-x^2-81=-(x^2+81)=-(x^2-(9i)^2)=-(x+9i)(x-9i)=(-x-9i)(x-9i)\to C.
8 0
4 years ago
line n passes through the points (-3, -7.5) and (2, -5). tahlia determined that the equation of line n is y = 0.5x. explain the
sweet-ann [11.9K]
<h2>Therefore Tahlia made mistake. Tahlia did not write -6 in her equation.</h2>

Step-by-step explanation:

Given , line n passes through the points (-3,-7.5) and (2,-5)

x_1 = -3 , y_1=-7.5   and     x_2 = 2 , y_2=-5

Therefore the slope of the line is (m)  =\frac{y_1-y_2}{x_2-x_1}

                                                        =\frac{-7.5+5}{2+3}

                                                        =\frac{2.5}{5}   =\frac{1}{2}

Therefore the equation of line is

y-y_1=m(x-x_1)

\Leftrightarrow y+7.5 =\frac{1}{2}(x+3)

\Leftrightarrow y+7.5 = 0.5x+1.5

\Leftrightarrow y = 0.5x+1.5 -7.5

\Leftrightarrow y = 0.5x -6

Therefore Tahlia made mistake. Tahlia did not write -6 in her equation.

5 0
3 years ago
Birth weights at a local hospital have a Normal distribution, with a mean of 110 oz and a standard deviation of 15 oz. The propo
Mila [183]

Answer:

<h2>125 is 1 dev above, so it's  13.5 + 2.35,</h2><h2>so it's B. 0.159</h2><h2 /><h2>And i think the proportion of infants with birthweights between 125 oz and 140 oz is :</h2><h2>D. 0.136</h2>
8 0
3 years ago
Benito spent $1761 to operate his car last year. Some of these expenses are listed below. Benito's only other expense was for ga
Serggg [28]
The averge per mile is 4.06
8 0
3 years ago
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