What is the value of Negative 3 r + 8 when r = 4?

The value of the expression, when r = 4 is "-4".

Step-by-step explanation:

Given the expression " - 3 r + 8", when we evaluate it at r = 4, we simply replace "r" with the given value "4" in the algebraic expression they give us, and perform the indicated operations among numbers:

-3 (4) + 8 = - 12 + 8 = - 4

Therefore, the requested value is: "-4".