Which expression is equivalent to (10 + 7r r − 2
) + (−6r2 − 18 + 5r)?

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

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 $s$?