How to factor the binomial 16-81n^4 (I need to know really quick my paper is due in a hour)

Penny has some money. After she pays $5 for her new kitten, she will have $27. How much money does she have now?

From a committee consisting of 5 men and 6 women, a sub-committee is formed consisting of 4 men and 3 women. How many different subcommittees are possible?

Sandra saves 12% of her salary for retirement. This year her salary was $3000 more than in the previous year, and she saved $4200. What was her salary in the previous year?

12+3 to the second power

List fractions and decimals in order from least to greatest - 2.3, - 24/5, 2.6

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.