In an arithmetic sequence, the first term is -8 and the sun of the first 20 term is 790. Find the common difference

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1

How to do this , and can some one explain

Someone answer asap for ! max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a. the median of max’s data is 250 b. more than half of the data points max recorded were 177 centimeters. c. a data point chosen at random is as likely to be above the mean as it is to be below the mean. d. every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.