Tolong ya kak dibntu jawab pertanyaannya terimakasih

12) anggap jam 12 malam = 24.00, 1 malam = 25.00, 2 malam = 26.00
4.15 pagi = 28.15 = 27.75
lama Budi tertidur = 27.75 - 21.40 = 6.35 = 6 jam 35 menit

13) 2^15 x 5^12 = 2^3 . 2^12 . 5^12 = 8 . (2 . 5)^12 = 8 . 10^12 = 8.000.000.000.000
jadi ada 13 digital angka (12 angka 0 + 1 angka 8 = 13)

14) √(x + √(x + √(x + √(x + .....)))) = 7 ====> kedua ruas dikuadratkan
x + √(x + √(x + √(x + √(x + .... )))) = 49
x + 7 = 49
x = 42

15) pl = 12 => p = 12/l
lt = 8 => t = 8/l

pt = 6
(12/l)(8/l) = 6
96/l^2 = 6
96 = 6l^2
l^2 = 16
l = 4

p = 12/l = 12/4 = 3

t = 8/l = 8/4 = 2

diagonal ruang = √(p^2 + l^2 + t^2)
= √(3^2 + 4^2 + 2^2)
= √(9 + 16 + 4)
= √29