A cell site is a site where electronic communications equipment is placed in a cellular network for the use of mobile phones. The numbers y of cell sites from 1985 through 2011 can be modeled byy = 269573/1+985e^-0.308t where t represents the year, with t = 5 corresponding to 1985. Use the model to find the numbers of cell sites in the years 1998, 2003, and 2006.

(a) 3178

(b) 14231

(c) 33152

Step-by-step explanation:

Given

Solving (a): Year = 1998

1998 means t = 8 i.e. 1998 - 1990

So:

--- approximated

Solving (b): Year = 2003

2003 means t = 13 i.e. 2003 - 1990

So:

--- approximated

Solving (c): Year = 2006

2006 means t = 16 i.e. 2006 - 1990

So:

--- approximated

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

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°