What of the following ratios are equivalent to 12: 15

a) 12: 15
b) 36: 45
c) 8: 9
d) 4: 5
select all that apply

What is always true when two whole numbers are subtracted?

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point

Zack and tia played chess for 50 min they put the chessboard away at 11: 20 when did they start