Tolong dibantu,, mana yg bisa aja.. Yaaa

5.a) L = 1/2 × 6 × 7 = 21

6.b) 9²¹ : 9^19 = 9^(21-19) = 9²
c) (2⁴)² = 2^4×2 = 2^8

7.a) ²log 8 + ³log 9 - 5^log 625
= ²log 2³ + ³log 3² - 5^log 5⁴
= 3 - 2 + 4
= 1 + 4 = 5