23x - 1 = 45
23x = 1 + 45
23x = 46
x = 46 : 23
x = 2
That is adjacent and huptonuse
soh cah toah
so that is cos
cos(x)=15/21
so tehrfor
cos⁻¹(15/21)=x
where cos⁻¹ means inverse not 1/cos
use your calculator to evaluate cos⁻¹(15/21) in degrees
it is about 44.4153 degres, rounded to 44 degrees
10min + 35min = 45min
Lester left 45min before 10:45AM
he left at 10AM