Answer:
A and C
Step-by-step explanation:
Given
2cos²x - 2 = 0 ( add 2 to both sides )
2cos²x = 2 ( divide both sides by 2 )
cos²x = 1 ( take the square root of both sides )
cos x = ± 
= ± 1
cos x = 1 ⇒ x = 
(1) = 0°
cos x = - 1 ⇒ x = (- 1) = 180°
Answer:
212 is the perimeter
Step-by-step explanation:
Answer:
The answer is "0.081"
Step-by-step explanation:
Dimes 
Calculating total coins 
P(for a dime) 
Calculating remaining coins 
Nickels 
P(for nickel draw in second) 
P(for a dime after that a nickel, without replacement)
A number - n
five times the number - 5n
nine more than five times the number - 5n+9
The answer is D.
