Saya butuh jwb 4,30,dan,28​

Jawaban:

28.

Diketahui U¹ = a = 25 dan U⁴= ar⁴ = 200

u⁴ = 200

ar³ = 200

25 x r³ = 200

r³= 8

r³ = ³√8

r³= 2

Sn = a(rn-1) / r-1

S⁴ = 25(2⁴-1) / 2-1

S⁴ =25(16-1)

S⁴ = 25 x15

S⁴ = 375

jadi jawaban 375 cm

30.

aritmatika

105, 112, 119, …., 196

a = 105

b = 7

Un = a + (n – 1) 7 = 196

105 + (n – 1) 7 = 196

(n – 1) 7 = 196 – 105

n – 1 = 91/7

n = 13 + 1

n = 14

Sn = n/2 x (a + Un)

S14 = 14/2 x (105 + 196)

S14 = 7 x 301

S14 = 2.107

jawaban A.2.107

terima kasih, jgn lupa follow