c)(-2)^3*5-(-12) d)-15-(341-15) e)23*15+15*(-77)-21 f)(-2)^2-(-3)^3-(-7)

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1. c) $(-2)^3 .5 -(-12)

   = $ -8 . 5  +12 $

   =$ -28$

   d) $-15 – (341 – 15)$
   $= (-15 +15) – 341$

   $= -341$

   e) $23.15 + 15. (-77) -21$

   $= 15( 23 -77) -21$

   $= 15. (-54) -21 $

   $= -831$

   f) $(-2)^2 – (-3)^3 – (-7)$

   =$ 4 + 27 + 7 $

   $= 38 $

    

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2. c)(-2)^3*5-(-12)

   =-28

   d)-15-(341-15)

   =-15-326=-341

   e)23*15+15*(-77)-21

   =15(23-77)-21=15.(-54)-21

   =-810-21

   =-831

   f)(-2)^2-(-3)^3-(-7)

   =$2^{2}$ +$3^{3}$ +7

   =4+27+7

   =38

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