70-49:7•4

To solve the expression \( 70 - 49:7 \cdot 4 \), we need to follow the order of operations, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)).

1. First, we perform the division: \( 49 \div 7 \). \[ 49 \div 7 = 7 \]

2. Next, we perform the multiplication: \( 7 \cdot 4 \). \[ 7 \cdot 4 = 28 \]

3. Finally, we perform the subtraction: \( 70 - 28 \). \[ 70 - 28 = 42 \]

So, the result of the expression \( 70 - 49:7 \cdot 4 \) is \( 42 \).