I'd seriously appreciate it if anyone could ! : ) i'll give brainliest! show your work. the depth of a river changes after a heavy rainstorm. its depth, in feet, is modeled as a function of time, in hours. consider this graph of the function. write the average rate of change for the depth of the river, measured as feet per hour, between hour 9 and hour 18. round your answer to the nearest tenth.

Lian is deciding which of two gyms to join. each gym charges a monthly rate plus a one-time membership fee. lian correctly wrote and solved a system of linear equations by substitution to compare the costs of the memberships. in her work, she substituted an expression for one variable and solved for the other. this resulted in the equation 75 = 75. what can lian conclude? one gym charges $75 per month. each gym charges $75 per month both gyms charge the same monthly rate and the same membership fee. both gyms charge the same monthly rate, but not the same membership fee.