1. Let's call the number of carter school: "x" and "y" the number of alternative school.  Then, you have that:
 - T<span>he number of charter schools is 4 less than twice the number of alternative schools.
</span> - T<span>here are 48 charter schools in the country.
 2. So, you have:
 x=2y-4  (i)
 x=48  (ii)
 3. Then, when you substitute x=48 into the equation (i), you obtain:
</span>
 x=2y-4
<span> 48=2y-4
 4. Now, you must clear "y, as below:
 48+4=2y
 2y=52
 y=52/2
 y=26
 </span><span>
 How many alternative schools are in the county?
</span><span>
 The answer is: There are 26 alternative schools.</span>
        
             
        
        
        
Answer:
67.5 units²
Step-by-step explanation:
We can break this problem down in two parts: The upper triangle and the lower trapezoid.
The upper triangle:
Use the formula  to compute the area of the triangle. Base = 10 and Height = 7.
 to compute the area of the triangle. Base = 10 and Height = 7. 
1/2 (10)(7)
1/2 (70)
=35 units².
The lower trapezoid:
Use the formula  to compute the area of the trapezoid. Base 1 = 10, Base 2 = 3 and Height = 5.
 to compute the area of the trapezoid. Base 1 = 10, Base 2 = 3 and Height = 5.
1/2 (10 + 3)(5)
1/2 (13)(5)
1/2 (65)
=32.5 units²
So, add the two areas of each shape:
35 + 32.5 = 67.5 units².
 
        
             
        
        
        
Answer:
3/10
Step-by-step explanation:
7+3= 10 so 7+3=10/10 which is one mile
 
        
             
        
        
        
Answer................:8x^2-2x-1