Answer:
18/20 
Step-by-step explanation:
You just have to multiply by 2
 
        
                    
             
        
        
        
The decimal multiplier to decrease by 30 is .7
        
             
        
        
        
Answer:
3
Step-by-step explanation:
Intersections on the x axis occur when y = 0. f(x) is another term for y, so set f(x) equal to zero and solve for the two possible x's. 
0 = x^2 - 3x - 40
0 = (x-8)(x+5)
By solving for x, you get 8 and -5. 8 and -5 added together will equal 3.  
 
        
             
        
        
        
Answer:
f(t) = 101,234
Step-by-step explanation:
First, use FV formula to find the rate ;r given PV=101,234 and FV=104,271.02 and time= 1 year

104,271.02 = 101,234
Divide both sides by 101,234 to get;
104,271.02 / 101,234 = 1+r
1.03 = 1+r
1.03 -1 =r
therefore r= 0.03 or 3%
Next, to get the function of FV of estate after t years; f(t) ;
Plug in the 3% rate found above into the FV formula with PV being the current value of 101,234 and it becomes;
f(t) = 101,234
 
        
                    
             
        
        
        
Answer:
-6
Step-by-step explanation:
-x/3=2
Multiply both sides by 3:
-x=6
Divide both sides by -1:
x=-6
Hope this helps!