It's scientific notation, so 1.4x10^7 would be 14000000 <span />
To get a number to decrease by 21% you multiply it by 0.79 (1-0.21)
r = 0.79
Answer:C and E
Step-by-step explanation:
To find the mean you must add up all the numbers and divide by how many there are:
35 + 60 + x
_________ = 70
3
35 + 60 + x = 210
x = 65
He must score at least a 65 for a 70 average.
