I need help with this I’m marking everyone as brainlest if awnser right

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Ataxi company charges $2.25 for the first mile and then $0.20 per mile for each additional mile, or f = $2.25 + $0.20(m - 1) where f is the fare and m is the number of miles. if juan's taxi fare was $6.05, how many miles did he travel in the taxi? if juan's taxi fare was 7.65, how many miles did he travel in taxi

What does independent variable and dependent variable mean in math?