There are 4 books. The math book can either be top, second from top, third from top, or on the bottom. The probability of being in any single given position is 1/4 = 25% .
Since each book can be put on the top, and there are 4 books, the chances of a math book going on the top is 1/4, while the other 3 chances are the other books. So your answer is 1/4 or 0.25
The probability that the mathematics book is on top when stacking four books is 25%. This is determined by dividing the number of arrangements with the math book on top (6) by the total arrangements of the books (24). Thus, P = 4 1 .
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Jawaban:Jadi fungsi permintaan:[tex]\boxed{Q_d = 100 - P}[/tex]Jadi fungsi penawaran:[tex]\boxed{Q_s = 30 + 1{,}5P}[/tex]Titik keseimbangan:Harga = Rp28Jumlah = 72 unitPenjelasan:mulai dari mencari:1. Fungsi Permintaan (Qd = a - bP)Diketahui:Saat harga Rp80, jumlah yang diminta 20 unitSaat harga Rp40, jumlah yang diminta 60 unitGunakan dua titik:[tex](P_1, Q_1) = (80, 20) \quad \text{dan} \quad (P_2, Q_2) = (40, 60)[/tex]Gunakan rumus garis lurus:[tex]Q = a - bP[/tex]Langkah 1: Cari nilai b (gradien)[tex]b = \frac{Q_2 - Q_1}{P_1 - P_2} = \frac{60 - 20}{80 - 40} = \frac{40}{40} = 1[/tex]Langkah 2: Cari nilai aGunakan salah satu titik, misal (P = 80, Q = 20):[tex]20 = a - 1 \times 80 \Rightarrow a = 20 + 80 = 100[/tex]Jadi fungsi permintaan:[tex]\boxed{Q_d = 100 - P}[/tex]2. Fungsi Penawaran ([tex]Qs = c + dP[/tex])Diketahui:Saat harga Rp40, jumlah yang ditawarkan 90 unitSaat harga Rp60, jumlah yang ditawarkan 120 unitGunakan titik:[tex](P_1, Q_1) = (40, 90) \quad \text{dan} \quad (P_2, Q_2) = (60, 120)[/tex]Langkah 1: Cari nilai d[tex]d = \frac{Q_2 - Q_1}{P_2 - P_1} = \frac{120 - 90}{60 - 40} = \frac{30}{20} = 1{,}5[/tex]Langkah 2: Cari nilai cGunakan titik (P = 40, Q = 90):[tex]90 = c + 1{,}5 \times 40 \Rightarrow c = 90 - 60 = 30[/tex]Jadi fungsi penawaran:[tex]\boxed{Q_s = 30 + 1{,}5P}[/tex]3. Titik Keseimbangan (Qd = Qs)[tex]100 - P = 30 + 1{,}5P[/tex][tex]100 - 30 = 1{,}5P + P \Rightarrow 70 = 2{,}5P \Rightarrow P = \frac{70}{2{,}5} = 28[/tex]Masukkan ke fungsi permintaan:[tex]Q = 100 - 28 = 72[/tex]Titik keseimbangan:Harga = Rp28Jumlah = 72 unit4. Gambar Grafik Fungsi Fungsi Permintaan:Garis turun dari titik (80, 20) ke (40, 60) — linear menurun.Fungsi Penawaran:Garis naik dari (40, 90) ke (60, 120) — linear naik.Titik perpotongan:Titik (P = 28, Q = 72) → keseimbangan pasar