35 multiple-choice questions to build fluency with Unit 4. Each has four choices and a full explanation of why each option is right or wrong.
Unit 4 is not on the AP Exam, so treat these as fluency-builders for calculus and linear algebra rather than exam prep.
Track the parameter. When eliminating t, keep the curve's orientation and any restrictions in mind: the rectangular form can lose them.
Work vectors componentwise and remember matrix multiplication is not commutative.
Check the determinant first. A nonzero determinant is what guarantees an inverse exists.