When a number is decreased by 20% of itself, the result is 20. what is the number?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Which line is parallel to the line that passes through the points (2, –5) and (–4, 1) a. y=-x+5 b. y=-2/3x+3 c. y=2/3x-2 d. y=x+5

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 $s$?