Write an algebraic expression that models the word phrase. the product of 8 and the sum of a number x and 3

"Sum" means addition, so the sum of a number x and 3 is
x + 3

"Product" means multiplication, so the product of 8 and x + 3 is
8(x + 3)

You need the parentheses to show it's the product of 8 and x + 3.
If you wrote only 8x + 3, that would mean the product of 8 and x, then you add 3 to it, which is different from your problem.

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The academic affairs council is the highest expert body processing academic affairs, as stipulated by the university statutes. specialist aaro häkkinen (educational policy) took part in the council’s meeting. the agenda of the meeting included bachelors’ feedback, the timing of pedagogical studies, the grant system for tuition fees, the standardisation of administrative practices for internships and the situation of foreign-language and multilingual master’s programmes.