Answer:
It's nine plus negative three
 
        
                    
             
        
        
        
Answer:
9 or 3.8x10^-6
Step-by-step explanation:
By flipping a coin you'd look at how many times a head could appear (1/2) and multiply that by the 18 times. 
Another explanation:
I'm not sure on this but would you raise 1/2 to the 18th power?
 
        
             
        
        
        
Answer:
<h3>Surface Area = 1,256 cm</h3>
<u>Solution:</u>
formula: Surface Area of a Sphere: 4π · r²
Surface area = 4π · r²
SA = 4(3.14) (10)²
SA =  (12.56)(100)
SA = 1,256
 
        
             
        
        
        
Answer:
<h3>perpendicular line:    
y = -¹/₆
x + 4¹/₃
</h3><h3>  parallel line:              
y = 6x - 45
</h3>
Step-by-step explanation:
y=m₁x+b₁   ⊥   y=m₂x+b₂   ⇔    m₁×m₂ = -1
{Two lines are perpendicular if the product of theirs slopes is equal -1}
y = 6x - 7   ⇒   m₁=6
6×m₂ = -1        ⇒    m₂ = -¹/₆
  
The line y=-¹/₆
x+b passes through point (8, 3) so the equation:
3 = -¹/₆
×8 + b must be true
3 = -⁴/₃ + b
b = 4¹/₃
Therefore equation in  slope-intercept form:
                                                      y = -¹/₆
x + 4¹/₃
y=m₁x+b₁   ║   y=m₂x+b₂   ⇔    m₁ = m₂
{Two lines are parallel if  their slopes are equal}
y = 6x - 7   ⇒   m₁=6   ⇒   m₂=6
The line y=6x+b passes through point (8, 3) so the equation:
3 = 6×8 + b must be true
3 = 48 + b
b = -45
Therefore equation in  slope-intercept form:
                                                      y = 6x - 45