Apopulation is declining. each year, only three quarters of last year's population remains. what is the constant percentage decrease per year?

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Larry wants to buy some carpeting for his living room. the length of the room is 4 times the width and the total area of the room is 16 square meters. what is the length of the living room