Aweb music store offers two versions of a popular song. the size of the standard version is 2.3 megabytes (mb). the size of the high-quality version is 4.9 mb. yesterday, the high-quality version was downloaded twice as often as the standard version. the total size downloaded for the two versions was 2904 mb. how many downloads of the standard version were there?

240

Step-by-step explanation:

Let x be the number of standard version and y be the number of high- quality version.

According to the question, we get the following equations

Substitute y=2x in (2), we get

Substitute x= 240 in (1), we get

Thus, the number of standard versions downloads = 240

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.  

a precentage of 6th graders. the population is all 6th graders. let me know if i'm wrong, i hope this ! : )

step-by-step explanation: