Add the following algebraic expressions using horizontal method: a) b) c) d) 8-2mn, 10-7mn, and 6 - 15mn Add the following algebrian expression using column method: a) b) c) d) PLS HELP

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

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation