Answer:
Step-by-step explanation:
25b * (3a² - 1) = 25b * 3a² - 25b * 1
                      = 75ba² - 25b
Distributive law upon subtraction:
a(x - y) = ax - ay
 
        
                    
             
        
        
        
To find the percent. A trick I learned in middle school was Dr. P
To turn a decimal to a percent and a percent to decimal... (look at picture)
Using that trick...
All you do is multiply $287.69 by .20
Which gives you $57.538 so you can round to either...
$57.54
Or
$57.50
Or 
$58
And one of those are your answer!
        
             
        
        
        
Answer: 

Step-by-step explanation:
See the attached picture for explanation. 
 
        
             
        
        
        
Answer:  
======================================================
Explanation:
Method 1
We can use the pythagorean theorem to find x.

-----------------------------------
Method 2
Use the sine ratio to find x. You'll need a reference sheet or the unit circle, or simply memorize that sin(60) = sqrt(3)/2

-----------------------------------
Method 3
Similar to the previous method, but we'll use tangent this time. 
Use a reference sheet, unit circle, or memorize that tan(60) = sqrt(3)

-----------------------------------
Method 4
This is a 30-60-90 triangle. In other words, the angles are 30 degrees, 60 degrees, and 90 degrees.
Because of this special type of triangle, we know that the long leg is exactly sqrt(3) times that of the short leg.

The short leg is always opposite the smallest angle (30 degrees).