HELPP 1. Jack's father was three-times older than jack. Five years ago the sum of their ages was 34. How old is Jack's Father?
2. jenny is four years older than Miki. Five years ago she was twice as old as he was. How old are they?
3. the ten digit of two digit number is 3 less than the unit number. Find the original number if the sum of that number and the number reversed is 143
PLEASE HELP

With this question substitute t=3 and t=5 to determine if the two expressions are equivalent. 4(t + 3) 4t+12 which statements are true? check all that apply. a. the value of both expressions when t =5 is 32. b. the two expressions are not equivalent. c. the value of both expressions when t=3 is 15. d. the value of both expressions when t=5 is 23. e. the two expressions are equivalent. f. the value of both expressions when t=3 is 24.