A medical researcher wishes to investigate the effectiveness of exercise versus diet in losing weight. Two groups of 25 overweight adult subjects are used, with a subject in each group matched
to a similar subject in the other group on the basis of a number of physiological variables. One of
the groups is placed on a regular program of vigorous exercise but with no restriction on diet, and
the other is placed on a strict diet but with no requirement to exercise. The weight losses after 20
weeks are determined for each subject, and the difference between matched pairs of subjects
(weight loss of subject in exercise group - weight loss of matched subject in diet group) is
computed. The mean of these differences in weight loss is found to be - 2 lb with standard
deviation s = 4 lb. Is this evidence of a difference in mean weight loss for the two methods? To
answer this question, you should use
(a) one-proportion z test
(b) one-sample i test
(c) one-sample z test
(d) one-proportion z interval
(e) one-sample t interval

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

i think is 3 and 6. this took me 10 min to think.hope to and hope that my answer is brainliest.(follow me )

answer: i guess 5 units?

step-by-step explanation:

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!