Answer:
The triangle is a right triangle
Step-by-step explanation:
We use the pythagorean Theorem which is a^2+b^2=c^2
Now we have 12^2+16^2=20^2
Solve: 144+256=400
400=400
(0.4)² = (0.4).(0.4) = 0.16
His error is, instead of raising (0.4) to exponent 2, he multiplied (0.4) by 2 , obviously which is wrong
Answer:

Step-by-step explanation:
Using the rule of exponents
=
, hence
f(- 2) =
=
= 
Step-by-step explanation:
I have solved the question it is in the picture I hope it helps