a. -1; -1; 1; -1; 1
b. 10⁴=10000; -10³= -1000, 10² = 100; -10⁷= -10000000; -10⁵= - 100000; 10⁸= 100000000; 1; -10
c. 4; 1; -2; -8; -32; 64
d. 1; -3; -9; 9; -81; 81
