18. equivalent
 16x5 does equal 10x8
19. equivalent
 13-0 does equal 0
20. Not equivalent
 12-2 doesn’t not equal 7-3
For all three of these equations you have to use PEMDAS (systems of equations) so first you solve everything that’s in parentheses, then any exponents, followed by multiplication,division,addition, and lastly subtraction. You MUST follow that order to get the correct answer.
        
             
        
        
        
Answer:
See Explanation
Step-by-step explanation:
The question is incomplete as the attachment of the prism is not given.
From the attachment:
 -- Length
 -- Length
 -- Width
 -- Width
 -- Height
 -- Height
Required
Determine the volume
So, the volume is:



 
        
             
        
        
        
Answer:  A) 126.6
<u>Step-by-step explanation:</u>
Since we know ∠B = 85° and ∠C = 53°, we can use the Triangle Sum Theorem (angles of a triangle = 180°) to calculate ∠A.
∠A + ∠B + ∠C = 180
∠A + 85 + 53 = 180
∠A + 138 = 180
∠A = 42
Now we have:
                        A = 42          B = 85       C = 53
                        a = 85          b = ???       c = ???
We have all of the information for ∠A and side a so we can use the Law of Sines to find b (AC).

 
        
             
        
        
        
The answer is c. Because 8*8=64