One Step Equations, need help with this one:

x+3=7

Thanks

anyone? find the second, fifth, and ninth terms of a sequence where the first term is 65 and the common difference is -7. 72, 93, 121 72, 79, 86 58, 37, 9 58, 51, 44

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?