Step-by-step explanation:

Remove backets

Evaluate like terms

Answer:
-3.2
Step-by-step explanation:
-16/5=-3.2
Answer:
If d is the height of the tree: d = 1/2m
Step-by-step explanation:
Answer:
a = 32
Step-by-step explanation:
This is a right triangle and the square value of hypotenuse is equal to sum of square value of other two side lengths
68^2 = 60^2 + a^2
4624 = 3600 + a^2
4624 - 3600 = a^2
1024 = a^2 find the root for both sides
32 = a