Review the following information about vectors q and r.q = ⟨–4, 1⟩r = ⟨a, 3⟩7(q + r) = ⟨–35, 28⟩

The second component checks out: 7(1 + 3) = 28. For the first component, 7(−4 + a) = −35, so −4 + a = −5 and a = −1. The correct choice is −1.

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