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= -7 - (-25)
= -7 + 25
= 18
b. 9 × (-3) × (-4)
= -27 × (-4)
= 108
c. (40:(-2)) : 5
= -20 : 5
= -4
b. 9 x (-3) x (-4) = -27 x (-4) = 108
c. [40 :(-2)] : 5 = [-20] : 5 = -4
2. a. (-3)² + (-4)³ - 6² = 9 - 64 +36 = - 17
b. (-5)² - 3² + 4³ = 25 + 9 + 64 = 98
c. 8² - (-3)³+ 9² = 64 - (-27) + 81 = 64 +27 +81 = 172
3. a. n² = 16
4² = 16
b. n³ = 64
4³ = 64