4) What is the solution of \( 86 \cdot 90= \) \( 5 a+100 ? \) AI B. 2 C 3 D 4

Let's solve the equation step by step: Given: \[ 86 \times 90 = 5a + 100 \] 1. **Calculate \( 86 \times 90 \):** \[ 86 \times 90 = 7740 \] 2. **Set up the equation:** \[ 7740 = 5a + 100 \] 3. **Subtract 100 from both sides to isolate the term with \( a \):** \[ 7740 - 100 = 5a \] \[ 7640 = 5a \] 4. **Solve for \( a \) by dividing both sides by 5:** \[ a = \frac{7640}{5} = 1528 \] **Result:** \[ a = 1528 \] However, looking at the provided multiple-choice options: - **B. 2** - **C. 3** - **D. 4** None of these options match the calculated value of \( a = 1528 \). It's possible there might be a typo or error in the question or the answer choices provided. Please double-check the equation and the available options to ensure they align correctly.