Show how 10-6 helps solve 50-6

Well 50 is just 10 x 5 so...

if you solve 10 + 6 = 16 then you can do 50 + 6 = 56

The digit in the ones spot will come out to be 4.

Step-by-step explanation:

Since the  are both an even number of ten, and you're subtracting 6, their both gonna come out to have a 4 in the ones spot in the number answer.

Option A

Step-by-step explanation:

we know that

In the right triangle ABC

see the attached figure to better understand the problem    

Let

------> the angle of elevation from the tip of the shadow to the top of the tree