Can someone me answer these questions i do not understand it plz?

Umm.. just started this 2day and its not on my notes(p′︵‵。)

Determine whether the samples are independent or dependent. upper a data set includes the morning and evening temperature for the lasta data set includes the morning and evening temperature for the last 90 days.90 days.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles