What is the slope of the line?

Can someone me with my hwplz(only the circled ones)

Acolony contains 1500 bacteria. the population increases at a rate of 115% each hour. if x represents the number of hours elapsed, which function represents the scenario? f(x) = 1500(1.15)" f(x) = 1500(115) f(x) = 1500(2.15) f(x) = 1500(215)

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.