## Algebra 1

a) The function was created by using the initial height of the whale which 3.5 meters below surface of water so it is negative. The slope is -1.8 because he Is going down at 1.8 m/s. The depth which is in meters, is a function of time which is in seconds because the rate of the driver going down is in m/s. b) Depth at 4 min s= 4 mins $\times$ $\frac{60 secs}{1 minutes}$ = 240 secs d(240)= -3.5 -1.8(240) = -3,5 -432 = -435.5 m Therefore the depth is 435.5 m.