If u need to go from radius to diameter multiply radius times 2: d=2r
Answer:
X = 9/2 or X = 3
Step-by-step explanation:
5x + 2 = 7x -7
5x - 7x = - 2 - 7
<u>2</u><u>x</u> =<u> </u><u>-</u><u>9</u>
2 2
X = - 9/2
or X = 3 (lowest term)
Answer:

Step-by-step explanation:
Using the difference formula for cosine and the exact values
cos45° = sin45° =
, cos30° =
, sin30° = 
cos(a - b) = cosacosb + sinasinb
Note 15° = 45° - 30°, thus
cos15°
= cos(45 - 30)°
= cos45°cos30° + sin45°sin30°
= (
×
) + (
×
)
=
+ 
= 
Answer: third option, 49x⁶y⁶
Justification:1) Given:

2) Property: power of a product

3) Property: power of power
Answer: The teachers will get 2 and 1/4 of a sandwich
Step-by-step explanation: