The mean weight of 7 people is 61 kg. Another person joins the group and th men falls to 69 kg . Calculate the weight of the eight person

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

For what values of x is x2 + 2x = 24 true?

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