Isabel had 21 coins in her collection. Frank had 3 times as many coins as Isabel had. Which equation can be used to determine the number of coins Frank had? * 21 ÷ _?_ = 3
3 x 21 = _?_
21 + 3 = _?_
3 + _?_ = 21

What situation is an example of an observational study

You are cycling around europe with friends. you book into a hostel and you ask the owner what the ratio of men to women is currently staying there. there are 24 men and 6 women. what is the ratio of men to women in its simplest form?

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39