Answer: I do not understand the options you gave but but cos30º is equal to  /2 which is 0.86602540378.
/2 which is 0.86602540378.
 
        
             
        
        
        
double every 6 months  
in 6 months there would be 250*2 = 500 crickets
 in 1 year there would be 500*2 = 1000 crickets
in 1.5 years there would be 1000 *2 = 2000 crickets
 in 2 years there would be 2000 *2 = 4000 crickets
 
        
             
        
        
        
1. Solve the bracket 4×x and 4 × -7 
4x-28=2x-6
2. Get the x on one side and the numbers on the other so: first +28
4x=2x+22 now -2x
so 2x=22 and now you only need to divide into 2
x=11
        
             
        
        
        
Answer:
1920 cubes.
Step-by-step explanation
Turn both the mix numbers into improper fractions. 
2 2/5 = 12/5 
3 1/5 = 16/5
Then you will turn 1/5 into its reciprocal and multiply both the improper fractions by it. You can just casually multiply 2 and 5.
12/5 * 5/1 = 12
16/5 * 5/1 = 16
2 * 5 = 10
Next you multiply all together to get 1920 cubes.
(I could be missing a step. I apologize if I did.)
 
        
             
        
        
        
To make this a little clearer, let's give the pairs of inequalities the same denominator:
<span>Question 1: 
</span>

 ? 

First, apply the common denominator to the first fraction:

Do the same for the second:

Nest, compare the two fractions:

Therefore:

 > 

<span>
Question Two:</span>

 ? 

Apply the common denominator to fraction one:

Fraction two:

Evaluate:

 > 

Therefore:
<span>
 >
 > 
</span>
Hope this helps!