A book sold 39600 copies in its first month of release. Suppose this represent 6.2% of the number of copies sold to date. How many copies have been sold to date?

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b