Tolong yaa jawabb,pake cara……jawabnya yg bener yaa yg bener dpt pahala lohhh,jawab nomor 13,14,sama nomor 15 pake cara yaaa

13) 2¹⁵ x 5¹²= 2¹². 2³ . 5¹²
= 2³. 2¹².5¹² . 
= 2³ ( 2 x 5)¹²
= 2³ (10)¹²
= 8 x 10¹²
banyak digit = 1+ 12 = 13

14) √(x+(√x +√x +…= 7
kuadratkan kedua ruasnya
x + √(x+√(x+√(x+… ) = 49
x + 7 = 49
x = 42

15. 
pl = 12
pt = 8
lt = 6

pl x pt x lt = 12(8)(6)
p². l² . t² = 12(8)6)
(p.l.t)² = 576
p l t = √576
pl t = 24

pl = 12 –> t = 24/12 = 2
lt = 6 –> p = 24/6 = 4
pt = 8 –> l = 24/8  = 3

diagonal ruang = √(p²+l²+t²) = √(29)