On the album 1989 by taylor swift, blank space is 12 seconds longer than shake it off. if the combined time of the two songs is 7 minutes and 30 seconds, how long is shake it off? give your answer in minutes and seconds.

Givens:

Lest's call Blank Space and Shake it Off, the relations would be

Now, we replace the first equation into the second equation and solve for :

Then, we replace this value into the first equation

This means that Shake It Off is 204 seconds long and Blank Space is 216 seconds long.

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

whatever you can spend with $11.53 or under.

step-by-step explanation:

20 - 8.47 = 11.53. take away the money he used for lunch from the starting amount of 20.