PLEEASE help as soon as posible

factor 18x^2 - 98y^2

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

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)