Answer: see proof below
<u>Step-by-step explanation:</u>
Given: cos 330 = 
Use the Double-Angle Identity: cos 2A = 2 cos² A - 1
Proof LHS → RHS:
LHS cos 165
Double-Angle: cos (2 · 165) = 2 cos² 165 - 1
⇒ cos 330 = 2 cos² 165 - 1
⇒ 2 cos² 165 = cos 330 + 1
Given: 
Divide by 2: 
Square root: 
Scratchwork: 
Since cos 165 is in the 2nd Quadrant, the sign is NEGATIVE
LHS = RHS 
The number becomes in the unit form is a 5 hundreds and 0 tens and the 5 ones.
According to the statement
We have given that the number and the we have to write in the unit form.
So, For this purpose, we know that the
The unit form is the way to show how many of each size unit are in a number.
From the given information:
The number is a 505/10×10
Now, we have to solve this And the number becomes is
505.
And the
5 hundreds and 0 tens the 5 ones.
The unit form becomes the 5 hundreds and the 5 ones.
So, The number becomes in the unit form is a 5 hundreds and 0 tens the 5 ones.
Learn more about unit form here
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X=2 or -7(answer choice A)
Answer:
$8.75
Step-by-step explanation:
Create a proportion where x is the cost for 7 bags:
= 
Cross multiply and solve for x:
4x = 35
x = 8.75
So, the cost of 7 bags is $8.75
Angle AQB is x = 90
Angle ASB is x = 90
Angle ALB is x = 90
Angle ATB is x = 90
Angle ARB is x = 90
<span>BWD is x < 90</span>
