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Write each of the following in index form:
(a) `log_2 ⁡8 = 3`             (g) `log_6⁡ 216= 3`
(b) `log_4 ⁡16 = 2`             (h) `log_x⁡ 40 = y`
(c) `log_5⁡ 125 = 3`             (j) `log_y⁡ x = 2`
(d) `log_10⁡ 8 = x`             (k) `log_10 ⁡10000 = 4`
(e) `log_b ⁡a = c`             (i) `log_4 ⁡6 = y`
(f) `log_3 ⁡27 = 3`             (1) `log_2 ⁡16 = 4`