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1b) 9 x 12 = 108
1c) (-20) : 5 = -4
2a) 9+64-36 = 37
2b) 25 - 9 + 64 = 80
2c) 64+27+81 = 172
3a) n=4
3b) 4
3c) 3
3d) 4^3= 4×4×4= (2×2)×(2×2)×(2×2)=2^6, n=6
3e) 3^8= 3×3×3×3×3×3×3×3 = (3×3)×(3×3)×(3×3)×(3×3) = 9×9×9×9 = 9^4, n=4
3f) 5^3 × 25 = 5^3 × 5^2 = 5^5, n=5
7 + 25 = 32
b. 9×(-3)×(-4) =
-27 × (-4) = 108
c. [40:(-2)] : 5 =
-20 : 5 =-4
2). a. (-3)² + (-4)³ - 6² =
9 + (-64) + 36 =
-55 + 36 = -19
b. (-5)² -3² +4³ =
25 + 9 + 64 =
34 + 64 = 98
c. 8²- (-3)³ + 9² =
64 - (-9) + 81 =
64 + 9 + 81 =
73 + 81 = 154
3). a. n² = 16
n = √16
n = 4
b. n³ = 64
n. = ³√64 = 4
c. n = ⁴√81 = 3
d. 2n = 4³
2n = 64
n = 64:2 = 32
e. 9n = 3 8
9n = 3×3×3×3×3×3×3×3
9n = 6561
n = 6561:9 = 729
f. 5³× 25 = 5 n
125 × 25 = 5n
3125 = 5n
3125:5 = n
625 = n