What do you need to subtract from 29/6 to make 4

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

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 $s$?

What number is 7 units left of -15?