15. What is the degree of the expression 5x2 + 7x - X"? A. 2
B. 3
0.7
c. a
-n
16. What must be the value of n so that the term xi-n is of degree 2?
A. - 2
B.- 1
D. 1
C. O
17. In the quadratic function of the form y = ax2 + bx + c, which of the following must not be equal to
0?
D. X-term
A. a
B. b
c. c
18. Which of the following is a quadratic function?
A. y = 5x - 4
C. y = 2x2 - 5x2
D. y = 21 - X-8
B. y = x - 3x2
19. Express f(x) = 3(x – 7)2 + 5, in the form f(x) = ax? + bx + c ?
A. f(x) = 3x2 - 21x + 152
C. f(x) = 3x2 – 212 + 54
B. f(x) = 3.x2 - 42x + 152
D. f(x) = 3x2 - 42x + 54
D. XA-1 = 2x
=
-
20. Which of the following is in the second degree equation?
A. 7x3 - 5x = 4
B. 2* - 3 = 16
C. 5x – 2x2 = 0

Q.1 dr. frank needs to choose 3 students from her advanced biology course to attend a conference in hawaii. the course has 40 students. which of the following methods could dr. frank use to choose a simple, random sample of 3 students? select all that apply. 1 dr. frank could have the students line up from shortest to tallest, then use her birthdate, 2/5/39, to select 3 students from the line (the 2nd student, the 5th student, and the 39th student). 2. dr. frank could upload her class roster into a spreadsheet and use a ranom-number generating function to produce 3 random numbers. the students whose names are located in the rows with these 3 numbers on the spreadsheet would be chosen. 3. dr. frank could choose the students with the 3 highest grades in the class. 4. dr. frank could count to three, then the first students to come to the front of the classroom and grab a golden ticket from her hand would be selected. 5. dr. frank could ask all students to write their name on a card, place all of the cards in a hat, shake the hat, and then pull 3 cards out from the hat. the students whose names appear on those 3 cards will be selected. 6. dr. frank could ask for volunteers to go to the conference, then choose the first 3 students who raise their hands. q2. now, choose one of the methods that you did not select and explain why this method would not result in a simple, random sample: