Astatistics instructor wants to measure the effectiveness of his teaching skills in a class of 75 students (n = 75). he selects students by waiting at the door to the classroom prior to his lecture and pulling aside every third student to give him or her a questionnaire. a. is this sample design an example of random sampling? explain. b. assuming that all students attend his class that day. how many students will the instructor select to complete his questionnaire?

ghjmutmum

step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!

it’s the first one your welcome