(b) a researcher discovers that between 2008 and 2010, the number of 13] messages sent on twitter (called tweets) increased exponentially. she investigates the number of tweets from a popular author, and finds that they can be modelled by the equation 20 x (1.8)', u where u is the total number of tweets sent, and t is the number of months since the author became a twitter user, where 0 ts 8. (i) copy and complete the table below, giving the total mumber of tweets sent (rounding to the nearest whole number). number of months since total number registering as a twitter user of tweets sent use the method shown in unit 13, subsection 5.2 to find the month in which the exponential model predicts that the total number of tweets sent will first reach 500. (ii) (ii) write down the value of the scale factor for the exponential model. use this to find the percentage increase in the total number of tweets each month page 9 of 10

Which of the following statements is not true? a. parallel lines are lines in the same plane that never intersect. b. congruent figures have the same shape and same size angles and sides. c. similar figures must have the same shape and the same size. d. a rotation is when you turn a figure around a certain point.

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution

Multiply and simplify. 2x^2 y^3 z^2 · 4xy^4 x^2 i will mark you brainliest if right. show how you got the answer, !