To determine a student’s overall test score for the semester, Ms. Lopez throws out the lowest test score and takes the average o
f the remaining test scores. Victor earned the following test scores in Ms. Lopez’s class this semester: 62, 78, 83, 84, and 93. What overall test score did Victor earn in Ms. Lopez’s class this semester? 67.6
67.6
It's a binomial times a binomial, so you FOIL First multiply the First numbers 3z*z = 3z(^2) Then multiply Outers: 3z* -4 = -12z Nest, Inners: 9*z = 9z Finally, the Lasts: -4*9 = -36 Then, throw it all together in descending order, starting with the variable of highest degree to lowest: 3z^2 - 12z + 9z - 36 Last of all, simplify coefficients with like terms and you're good to go: 3z^2 - 3z - 36 Hope this helps!
