Question 65899
If a=0.65 and b=1.28 and c= -5/2,evaluate -a(-b)+c.
-0.65(-1.28)+(-5/2)
=0.832-(5/2)
=0.832-2.5
=-1.668
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The next one is solve the equation for x, 6x minus 18=4x+8 
6x-18=4x+8
Subtract 4x from both sides to get:
2x-18=8
Add 18 to both sides to get:
2x=26
Divide both sides by 2 to get:
x=13
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And the last one is solve the equation for n,-55 minus 4n=13
-55-4n=13
Add 55 to both sides to get:
-4n=42
Divide both sides by -4 to get:
n=-10.5
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Cheers,
Stan H.