Question

1. solve:

3 • 5 + 12 - 1 • 2²

Explanation:

Step1: Calculate exponents

First, we calculate the exponentiation part. We have \(2^2\), which is \(2\times2 = 4\). So the expression becomes \(3\cdot5 + 12 - 1\cdot4\).

Step2: Perform multiplications

Next, we do the multiplications. \(3\cdot5 = 15\) and \(1\cdot4 = 4\). Now the expression is \(15 + 12 - 4\).

Step3: Perform additions and subtractions

Then, we add and subtract from left to right. First, \(15 + 12 = 27\). Then, \(27 - 4 = 23\).

Answer:

23