4The Freedom Tower in New York City has 102 floors with elevators that travel at astonishing speeds. The scatterplot shows the relationship between the floor number, y, and the average
number of seconds the elevator takes to descend from floor 102 to floor x.
Freedom Tower
Floor number
110
100
90
80
70
60
50
40
30
20
10
х
3
6 9 12 15 18 21
Time (seconds)
nme
to D
What is the best prediction for the number of seconds it will take the elevator to descend
from floor 102 to floor 50?

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents

so, converting firstly the mixed fractions to improper fractions and then "adding".

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!

16.80 times .20= 3.36

step-by-step explanation: