Answer:
Equivalent expressions
A) 
C) 
Step-by-step explanation:
Given expression :

Choices given :
A) 
B) 
C) 
D) 
To find the equivalent expression.
We will first evaluate the given expression.

⇒
[Quotient of a negative dividend and a positive divisor is always negative]
Evaluating each choice to select the equivalents.
A) 
⇒
[Quotient of a positive dividend and a negative divisor is always negative]
B) 
⇒ 
⇒ 
C) 
⇒
[Product of a positive and a negative is always a negative]
⇒ 
D) 
⇒
[Product of two negatives is always a positive]
⇒ 
∴ We see that the choices A and C are equivalent.
C by AA- bc 180 degrees in a triangle
Answer:
θ = π/3, 5π/3
Step-by-step explanation:
2 cos θ - 1 = 0
2 cos θ = 1
cos θ = 1/2
θ = π/3, 5π/3
Answer: 1:50
The scale factor is 5/250 = 1/50