Answer:
{-2, 1, 4, 13}
Explanation:
The range of a function is the set of y-values it produces for the set of input values in the domain.
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When calculations are repetitive, I like to let a calculator or spreadsheet do them.
Here, you're being asked to evaluate 3x+1 for different values of x.
You can do them one-at-a-time, or all-at-once. I like the latter approach:
y = 3{-1, 0, 1, 4} +1
y = {-3, 0, 3, 12} +1
y = {-2, 1, 4, 13} . . . . . the range of the function