Final answer:
The constant term in the algebraic expression -x squared 2 -6y+13x+7 is 7. Therefore, the correct answer is C. 7.
Step-by-step explanation:
The question asks which number is a constant in the algebraic expression -x squared 2 -6y+13x+7. In an algebraic expression, a constant is a number that does not change and is not multiplied by a variable. Based on the given expression, the constants are -6, 7, and 13. However, the term -x squared, which might be a typo for x squared or -x2, is not a constant because it includes the variable x. So, the constant terms in the corrected expression -x2 -6y+13x+7 are -6 and 7. Considering the options provided (A -6, B -1, C 7, D 13), -1 is not present in the expression, making it incorrect. The term 13x includes a variable, so 13 is not a constant. Therefore, the number 7, which does not have a variable attached to it, is the constant term.
Correct Answer: C. 7