Jumlah n suku pertama suatu deret adalah Sn:3n²-5n.suku kesepuluh deret tersebut adalah

x - red y - blue
y x ​ = 7 4 ​ y x + 10 ​ = 7 6 ​ 7 x = 4 y 7 x + 70 = 6 y 4 y + 70 = 6 y 2 y = 70 y = 35 7 x = 4 ⋅ 35 7 x = 140 x = 20

Answered by konrad509 | 2024-06-10

There are 35 blue cubes in the bag. Initially, the ratio of red to blue cubes was 4:7. After adding 10 red cubes, the ratio changed to 6:7, allowing us to calculate the total number of blue cubes.
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Answered by konrad509 | 2024-10-09

Jawaban:52Penjelasan dengan langkah-langkah:Sn = 3n² - 5nn/2(2a + (n - 1)b) = 3n² - 5nn(2a + (n - 1)b) = 6n² - 10nn(2a + bn - b) = 6n² - 10n2an + bn² - bn = 6n² - 10nbn² + 2an - bn = 6n² - 10n.Nilaibn² = 6n²b = 6.2an - bn = -10n2a - b = -102a - 6 = -102a = -4a = -2Suku ke 10Un = a + (n - 1)bU10 = -2 + (10 - 1)(6)U10 = -2 + 9(6)U10 = -2 + 54U10 = 52[tex]\boxed{ \red{ \boxed{\pink{\mathcal{M \frak{ ilana} \purple{ \tt01}}}}}} [/tex]

Answered by Milana01 | 2025-07-04