Answer:
35cm
Step-by-step explanation:
Given data
Length= 21cm
Width= 28cm
Diagonal= ???
Applying Pythagoras theorem
D^2= L^2+W^2
D^2= 21^2+28^2
D^2= 441+784
D^2= 1225
D= √1225
D= 35cm
Hence the diagonal is 35cm
 
        
             
        
        
        
Answer: $300
Step-by-step explanation:
Mr. Calvin earned  
He spent   on food i.e.
 on food i.e.



Remaining money = 
So, he saved $300 after expenses
 
        
             
        
        
        
Answer:
x = 6
Step-by-step explanation:
Verticle angles are formed when two lines intersect. The angles opposite each other are congruent, those angles are called vertical angles.
Using this knowledge, one can say;
3x + 2= 20
Use inverse oeprations to solve for "x"
3x + 2 = 20
      -2       -2
3x = 18
/3      /3
x = 6
 
        
             
        
        
        
_________X=30____
_________-________