Here is my question answer and give a good explanation: which expression cannot be used to calculate the total amount paid for a meal (m) including a 15% tip?
a. m+0.15m
b. m+1.15m
c. m+3/20m
d. 1.15m

In a column proof the right column states your reasons

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?