Solve for n.

12n+34n=12

enter the answer, as a whole number or as a fraction in simplest form, below.
n =

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

Yvaries inversely as x. y =12 when x=5. find y when x=4

Find the percent cost of the total spent on each equipment $36, fees $158, transportation $59 a. 14%, 62%, 23% b. 15%, 60%, 35% c. 10%, 70%, 20% d. 11%, 62%, 27%