Hey, Melany. To answer this problem, simply set up a proportion:  . Now let's solve for x.
. Now let's solve for x.
- Cross multiply:
- Isolate x:

This means that x = 24.
There are 24 9th graders in the band.
 
        
             
        
        
        
The real solutions are {

}.
The imaginary solutions are {

}.
 
        
        
        
Answer:
66.67%
Step-by-step explanation:
80/120 = 66.67
 
        
             
        
        
        
Add 3 to both sides so that the equation becomes -2x^2 + 5x + 5 = 0. 
To find the solutions to this equation, we can apply the quadratic formula. This quadratic formula solves equations of the form ax^2 + bx + c = 0 
                              x = [ -b ± √(b^2 - 4ac) ] / (2a) 
                              x = [ -5 ± √(5^2 - 4(-2)(5)) ] / ( 2(-2) ) 
                              x = [-5 ± √(25 - (-40) ) ] / ( -4 ) 
                              x = [-5 ± √(65) ] / ( -4) 
                              x = [-5 ± sqrt(65) ] / ( -4 ) 
                              x = 5/4 ± -sqrt(65)/4 
The answers are 5/4 + sqrt(65)/4 and 5/4 - sqrt(65)/4..
        
             
        
        
        
Answer:
2 added to cube of 5 times x
Step-by-step explanation: