Answer:
u divide all numbers by 1000
Step-by-step explanation:
Answer:
V = 126 yd3
Step-by-step explanation:
The base: 
The volume: 
Hope this helps
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:
