Which of the following is a biased sample of the people who shop at a shoe store? a) Select every tenth shopper.
b) Choose the 10 most frequent shoppers.
c) Put the name of every shopper into a box and pick 10 shoppers without looking.
d) Select one shopper who enters the store every half hour until 10 shoppers have been chosen.

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.