Well x=1 always unless it tells you other wise so 1+0.5 would equal 1.5 and so after that you keep adding so 1.5 + 0.5 equal 2 so you keep taking the previous answer and adding 0.5 to it
Find the surface area of what?
if the mean is 70 minutes, then 90 minutes is 2 standard deviations above 70. if you look at the bell curve i drew, the percent of exams that took over 90 minutes is 2.5%
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No because irrational cant be a simple fraction and 9/15
is 0.6
so... it is not irrational
Either you can use distributive property or you can add up the numbers in the brackets.
Hopefully that helped! :)
