If the original quantity is 10 and the new quantity is 15, what is the percent increase?

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

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

Siri can type 90 words in 40 minutes about how many words would you expect her to type in 10 minutes at this rate