How do i go about calculating 40% of 80

In test of significance about an unknown parameter of some population, which of the following considered strong evidence against a null hypothesis

What type of electric current does a power plant generate for use in your home?

A large community college has professors and lecturers the total number of faculty members is 136. The school reported that they had six professors for every 11 lecturers how many professors does the Community College employ

What is the probability of flipping three heads in a row?

Rewrite the expressions by using distributive property and collecting like terms 4/5 (1/4c-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.