1. The problem states that a phone plan costs 25 plus 0.10 per text. We need to write an expression for the total cost if $t$ texts are sent. 2. The formula for total cost $C$ when sending $t$ texts is: $$C = 25 + 0.10t$$ This is because the fixed cost is 25 and each text adds 0.10 to the total. 3. To find the cost for 120 texts, substitute $t = 120$ into the expression: $$C = 25 + 0.10 \times 120$$ 4. Calculate the multiplication: $$0.10 \times 120 = 12$$ 5. Add the fixed cost: $$C = 25 + 12 = 37$$ 6. Therefore, the total cost for 120 texts is 37.