Pl ! hurry
i'll reward u with everything
show that

Step-by-step explanation:

note :

tanx = sinx/cosx      and secx = 1/cosx

1+tan²(2π/3) =  1+(sin2π/3/cos2π/3)²

= 1 +( sin2π/3)²/(cos2π/3)²

=( sin2π/3)²+(cos2π/3)²/(cos2π/3)²

but :   ( sin2π/3)²+(cos2π/3)²=1

so :1+tan²(2π/3) = 1 /(cos2π/3)²

                          =( 1/cos2π/3)²

:1+tan²(2π/3) =sec²( 2π/3)

the function makes a strait line horizontally with no x intercept but a y intercept at 9.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)