37.5 grams of contaminants will remain after 4 hours.
DOB
that is from 55 to 145
acute means angle is less than 90 degrees
right means equal to 90
obtuse means greater than 90
so
55 to 145
145-55=90
it is right angle
B. 11% The reason why is because it says "expect" This is a theoretical question. I was thinking about this for a while until i remembered what my teacher had taught me in the 7th grade!
15 minutes is 25% of an hour. You can tell this because there are exactly 4 15 minute periods in one hour.
Hope this helped.


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Standard equation of circle is :

Since the circle is centered at origin, h = k = 0


Answered by : ❝ AǫᴜᴀWɪᴢ ❞