First, we can tell that this problem is going to be an inequality because it uses "no more than," implying that the number can be less than 42, but not more than 42. This also means that it will use a less than or equal to sign.
Then, write out an inequality as the problem says. Twice the number would just be multiplying it by 2. The difference of this number and 10 just means to subtract 10.
Therefore, the finally written inequality is:
2c - 10 ≤ 42
