Final answer:
The expression to 'triple 4 and then add 7 times 7' is written as '3×4 + 7×7'. Simplifying this expression results in 12 + 49, which equals 61.
Step-by-step explanation:
The student has asked for an expression which represents the calculation 'triple 4 and then add 7 times 7'. The mathematical expression for tripling the number 4 would be '3×4' or simply '12', since tripling means multiplying the number by 3. Next, to 'add 7 times 7', we would calculate '7×7', which results in 49. So, the complete mathematical expression for the calculation requested is '3×4 + 7×7'.
Putting it together, we arrive at the expression 12 + 49, which simplifies to 61. This expression first triples the number 4 and then adds the product of 7 times 7.