Apencil is located 15 cm from a concave lens with a focal length of 30 cm. where is the image located?

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?