Answer:
0.7999989281
Step-by-step explanation:
x1 = cos^-1 (3/5) 
x1= 53.13° 
sin(53.13) = 0.7999989281
 
        
             
        
        
        
1)8
2)3
3)1
4)14
the coefficient is the number in front of the variable
        
             
        
        
        
Answer:
A.) 6.0
Step-by-step explanation:
I dont explain very well, but..
if the next number is above or it is 5, then u round up
 
        
             
        
        
        
Answer:
 or 2.738
 or 2.738
Step-by-step explanation:
Let’s just look at the triangle on the top with the  on the top and x on the bottom. (Basically the top half to the equilateral triangle)
 on the top and x on the bottom. (Basically the top half to the equilateral triangle)
There is a small square in the bottom right corner, which indicates that this triangle is a right triangle. This means that we can use the Pythagorean Theorem: 
We know that \sqrt{10} is our hypotenuse, and therefore our c in our equation. Let’s say that x=a in our equation. Therefore we are left to find b. However, b is half the length of the side of the original equilateral triangle. An equilateral triangle means that all three sides are the same length. Therefore our side would also be \sqrt{10} units long. However we know that b is half of that value, so b= or
 or 
Plugging these values into the equation:
x^2+ (\frac{\sqrt{10} }{2})^{2}=\sqrt{10} ^{2}




This approximately equals 2.738
 
        
                    
             
        
        
        
Answer:
You don't really need to do it, but it helps you keep things more organized and easier to follow. Imagine if you're doing some multi-variable equation,
2a + 5b + 4d + 3c + b + a + 2d
that looks like a mess, it'll be easier to look at if you put all the similar variables next to each others like this:
a + 2a + b + 5b + 3c + 2d + 4d
(a + 2a) + (b + 5b) + 3c + (2d + 4d)
now you can add them up much easier.