Answer: I subtracted 8 from both sides then divided 3 on both sides
Step-by-step explanation: welcome
Answer:
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Step-by-step explanation:
Answer:

Step-by-step explanation:
To solve this problem you must know the formula of subtraction of angles for the function cosx.
The formula is:

We can write 30° as: 45° - 15°
Then:

Using the formula for subtraction of angles we have:

Notice that we have achieved the expression shown in the statement
Finally:

3.46 to the nearest tenth is 3.5
6 is greater than 5, and so you round up
3.5 is your answer
hope this helps