How to write 8 21/40 as a decimal

A freshman English class at a certain college has 49 women and 20 men. If 5 students are randomly selected, what is the probability that they are all men? Round to five decimal places.

Write a positive or negative integer an increase of $15

Dean's sons are on the high school basketball team. Their heights are 73 inches, 69 inches, and 76 inches. How much taller is the tallest son than the shortest son?

A camp counselor starts from home and drives to a campground. The expression 130-60t represents the distance, in miles, the counselor still needs to drive after t hours. What does the 60 in the expression represent?

Add or subtract the fractions by changing them to equivalent fractions with denominator equal to the LCD of the fractions. A: 2/5+1/5

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.