Question

Tolong guys nomor 11 sampai 14 guys

Answer 1

Jawab:

Penjelasan dengan langkah-langkah:

11. Panjang = 24 cm  Lebar = (7x-10) cm Luas = tdk kurang dr 600

24(7x-10) ≥ 600

168x - 240 ≥ 600

168x ≥ 600 + 240

168x ≥ 840

x ≥ 5 cm (C)

12. A = {1,2,3,4,5,6,7,8,9,10}

     B = {2,3,5,7,11}

A - B = {1,4,6,8,9,10} (C)

13. Gemar Matematika = 20 siswa

    Gemar bahasa Inggris = 25 siswa

    Tdk gemar mtk & b.ing = 5 siswa

    Pertama, cari jumlah siswa yang gemar mtk & b.ing

    40 = (20-x) + (25-x) + x + 5

    40 = 50 -x

     x = 50 - 40

     x = 10 siswa

     Gemar b.ing saja = 25-10 = 15 siswa (C)

14. f(x) = x² - 4x + 2

    f(2) = 2² - 4(2) + 2

          = 4 - 8 + 2

          = -2

    f(-2) = (-2)² - 4(-2) + 2

          = 4 + 8 + 2

          = 14

    f(2)/f(-2) = -2/14 = -1/7 (B)