Answer:
22
Step-by-step explanation:
To solve this we can plug the values in.
-2x-3y+z
-2(4)-3(-7)+(9)
Simplify.
-8+21+9
Add.
22
 
        
             
        
        
        
Sorry if my handwriting sloppy.
I showed all of it step by step.
 
        
             
        
        
        
For number one 
S: supplement. 
R: angle1+angle8 =18
#2
S: supplement
R: angle 3+ angle 6=180
        
             
        
        
        
Answer:
1232 m^3 to nearest whole number.
Step-by-step explanation:
The volume of a cone = 1/3 π r^2 h     where r = radius of base and h = height.
The radius of the base = 1/2 * 14 = 7m.
The height can be found by using the Pythagoras theorem:
25^2 = h^2 + 7^2
h^2 = 625 - 49 = 576
h = √576 =  24m
So the volume = 1/3 π *  7^2 * 24
=  1231.504 m^3.