Question 65899
The first problem is: 


-a(-b) + c given a = 0.65, b = 1.28 and c = -5/2 



-0.65(-1.28) + (-5/2) 


-0.65(-1.28) - (5/2) [Multiply the first two terms and product of two negatives is a positive]


0.832 - 2.5 [Subtract each other]


= -1.668 [negative since, 2.5 is greater and has a negative sign]


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Solve for x: 


6x - 18 = 4x + 8 


Grouping the like terms, we get: 


That is x on one side and numbers on the other side. 


Adding 18 - 4x on both sides, we get: 



6x - 4x = 8 + 18 


2x = 26 


x = 26/2 


x = 13 


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Solve for n: 


-55 - 4n = 13 


Adding 4n - 13 on both sides of the above equation, we get: 


-55 - 13 = 4n 


-68 = 4n 


hence, we find out the value of "n"


n = -68/4 


Therefore, n = -17 


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Hence, the solutions. 


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