Final answer:
Like terms are terms that have the same variable(s) raised to the same power(s). A, B, C, and D do not have like terms.
Step-by-step explanation:
Like terms are terms that have the same variable(s) raised to the same power(s). Let's go through each expression to see if they have like terms:
A. 14m + mn: There are no other terms with the variable 'm' or 'n', so there are no like terms.
B. 2y + 2x + 4: There are no terms with the same variables and powers, so there are no like terms.
C. -3/4m + 8m + m: The terms '-3/4m' and 'm' have different powers, so they are not like terms.
D. 4 - 3p: There are no other terms with the variable 'p', so there are no like terms.
E. 5.75t + 7.75t - t: The terms '5.75t' and '7.75t' have the same variable and power, so they are like terms. However, the term '-t' has a different sign, so it is not a like term.
F. 8xy - 6xy: The terms '8xy' and '6xy' have the same variables and powers, so they are like terms.
Therefore, the expressions that do not have like terms are A, B, C, and D.