Salma gives a cashier $20 bill. She is buying an item for $9.85. How much money should salma get back

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

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.