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

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Need this at the city museum, child admission is 6 and adult admission is 9.20. on tuesday, 132 tickets were sold for a total sales of 961.60. how many adult tickets were sold that day?

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be