Misha’s group was asked to write an expression equivalent to 7 y squared z + 3 y z squared minus 3. When Mr. Chen checked their answers, he found only one to be correct. Who had the correct answer? Misha’s Group Student Equivalent Expression Misha 4 y squared z minus 5 + 3 y z squared minus 3 y squared z + 2 Juan 9 y squared z minus 2 + 3 y z squared minus 2 y squared z + 1 Joe 7 y squared z + y z squared + 2 + 2 y z squared + 1 Helena 7 y squared z + 6 y z squared minus 5 minus 3 y z squared + 2 Misha Juan Joe Helena