Answer all questions for brainlist and 30 points

All answers in explanation...

Step-by-step explanation:

16: S = more shoes than Ruben   10+s

17: M = money spent on dinner  M-5

18: M = Mary's ringtones   3 + 2M

19: C = cost S= shoe rental    C = S + (3*4)

20:  C= cost   C + 12.75 + (4 * 3)

Hope this helps :)

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98