She should use a computer to select 30 students at random then ask which ones play chess. The other options could produce more skewed results.
B
Step-by-step explanation:
Answer:
-4m^5n on egde
Step-by-step explanation:
Step-by-step explanation:
pen=1.35 + pencil......1
5pen+8pencil=13.5 calculate this for pen
pen=13.5-8pencil/5.....2 combine equation 1$2