After the last ice age began, the number of animal species in Australia changed rapidly. The relationship between the elapsed time, t. in years, since the ice age began, and the total number of
animal species, S(t), is modeled by the following function:

S(t) = 4,200,000 - (0.72)t

10000

Step-by-step explanation:

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.