bantu yah .. thank's kk

KALAU TIDAK SALAH jawabnnya kayak gini

Bab Eksponensial
Matematika SMP Kelas IX

2a] 5 + 3 x 2^4
= 5 + 3 x 16
= 5 + 48
= 53

2b] 1/2 (6^3 - 4²)
= 1/2 x (216 - 16)
= 1/2 x 200
= 100

2c] 8 + 3 x (-3)^4
= 8 + 3 x 81
= 8 + 243
= 251

2d] (6^4 - 4^4) : 2
= (1.296 - 256) : 2
= 1.040 : 2
= 520

2e] (1/4)^4 x (-1/3)²
= 1/256 x 1/9
= 1/2.304

2f] (1/4)^4 : - (1/3)²
= 1/256 x (-9)
= -9/256

10a] Amoeba
2 kali dalam 15 menit, atau berkembang setiap 7,5 menit

1 hari = 24 jam x 60 menit
1 hari = 1.440 menit

n = 1.440 menit / 7,5 menit
n = 192

Mula-mula = a = 4 amoeba

Karena membelah diri, maka r = 2
Un = a x r^n
U192 = 4 x 2^192
U192 = 2^2 x 2^192
U192 = 2^(192 + 2)
U192 = 2^194

b] 1 jam = 60 menit
n = 60 / 7,5
n = 8

Un = a x r^n = 1.000
a x 2^8 = 1.000
a x 16 = 1.000
a = 1.000/16
a = 62,5
Dibulatkan ke atas = 63

Jadi, mula-mula terdapat 63 amoeba

Karena jika 62 amoba, maka tidak sampai minimal 1.000 amoeba