Question

Tolong matematika beserta caranya ya

Answer 1

23. a = 20
r = 2
n = 1jam/12 menit = 60/12 = 5
U5 = 20 x 2^5 = 20 x 32 = 640

24. U1 = 4 , U5 = 324
U5/U1 = ar⁴/a = 324/4 = 81
r =⁴√81 = 3
S5 = 4(3^5 -1)/(3-1) = 2x (243-1) = 2x242 = 484 cm

25. beda = (118-100)/3 = 6
U12 = 100 + 11x6 = 100+66 = 166cm