Five times a number decreased by nine is equal to twice the number increased by 23. which equation could be used to solve the problem? how does it look written out

Ahigh definition tv cost $800 with a down payment of 2/5 of the cost. how much is left to pay, in dollars after the down payment has been made?

Don't know how to find x given these segment lengths

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)