Can you help me with slopes and equations please

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c

If you measured the width of a window in inches and then in feet with measurement would you have the greater number of units