5-3•10

To solve the expression \( 5 - 3 \cdot 10 \), you should follow the order of operations (PEMDAS/BODMAS):

1. First, do the multiplication: \[ 3 \cdot 10 = 30 \]

2. Then, subtract: \[ 5 - 30 = -25 \]

So, \( 5 - 3 \cdot 10 = -25 \).