Solve using the quadratic formula. (Identify a, b, and c. Write the formula. Show the substitution step. Show all work.) 7x^2 + 8x - 9 = 0

Which is the graph of the function y=2(4)^x

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

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