Answer:
A = 120 cm^2
Step-by-step explanation:
The formula for surface area of a rectangular prism is:
A = 2(area of the top) + 2(area of the front) + 2(area of one side)
Substituting the values:
A = 2(20) + 2(16) + 2(24)
First, distributing:
A = 40 + 32 + 48
Then adding, giving your final answer
A = 120 cm^2
Hope this helps you :)
 
        
             
        
        
        
Answer:
Step-by-step explanation:
She has 290 cents. 
Nickels: 6x+1
Quarters: x
Dimes: 4x
Now that we've converted it algebraically, we can add them
6x+1 + x + 4x = 11x+1 = 290
11x = 289
x = 289/11
let me know if incorrect, i will fix
 
        
             
        
        
        
Answer:
The answer to your questions is: 25 new teachers
Step-by-step explanation:
Data
# of students = 2000
ratio = 3:80 teachers to students
New teachers = ?
Process
I suggest to use rule of three to solve this problem
                      3 teachers ----------------  80 students
                       x                ----------------  2000 students
                   x = (2000 x 3) / 80 = 75 teachers 
                Number of initial teachers = 75
The ratio change to 1:20
                      1 teacher -------------------  20 students
                      x             -------------------   2000 students
                      x = (2000 x 1) / 20
                     x = 100 teachers
Number of new teachers = 100 - 75 = 25 
 
        
             
        
        
        
You have to divide your friends weigh by 1.2 to get  the result. : if you were 1.2 times taller than they, you would multiply, so the oppisite is dividing!
so  it will be 64.5/1.2=53.75. 
        
                    
             
        
        
        
Answer: the second one
Step-by-step explanation:
The first one is reflection over the x-axis, rotated, and translated. The third one is rotated 90 degrees