I'm stuck on this problem in math. x/5 + x/7 = 7/10 i know i have to find the lcd is 70 but i get 5/12 and it says i'm wrong

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

An account with a $250 balance accrues 2% annually. if no deposits or withdrawals are made, which graph can be used to determine approximately how many years will it take for the balance to be $282? it's e2020 ni️️as

Which number line correctly shows 0.8 + 0.3?