Final answer:
The term at position 10 in the sequence, which is described by the formula 5n, is 50.
Step-by-step explanation:
The given sequence is described by the formula for the nth term, which is 5n. To find the term at position 10, you substitute n with 10 in the formula. Hence, the term at position 10 in the sequence will be 5 × 10.
To complete the calculation, multiply 5 by 10 which equals 50. So, the correct number to be put in the box is 50, which means 'The term at position 10 in the sequence is 50'.