Side length-80
So we know that for a Right Angle, both sides have to measure up to 90 degrees. If one side is 10, and both sides need to add up to 90, then we can take 10 away from 90. That would be 80. 80 + 10 = 90. So the missing side length is 80.
-DustinBR
There are 9 numbers less than 10. 1,2,3,4,5,6,7,8,9
And there are 2 multiples of 15. 15,30
There are 11 of the 40 cards that are either less than 10 or multiples of 15, so the answer is B
When plugging this into the calculator, you find:

The answer would be 8.9.
Multiply by 1 minute/60 seconds
the minutes cancel out and youre left with 0.65 kilograms per second
you then multiply by 1000 grams/1 kilogram
the kilograms cancel out and youre left with 650 grams per second