I don't know if it should be called "preference", but if an expression has both multiplication and addition in it, then the multiplication has to be done first. This is only because you'll get the wrong answer the other way, not because there's anything preferable about multiplication.
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nope. Multiplication is a form of addition. Division is a form of subtraction.
2 and 2 0 and 0
With multiplication, 8 With addition, 42 With subtraction, 54 With division, 288
They give us different results. The dot product produces a number, while the scalar multiplication produces a vector.
It's difficult to know from the wording of the question whether you want addition or multiplication. 24 plus -6 = 18 24 times 3/4 = 18