Why is number seven prime?

If f (x) = 2x2^2 + 1 and g (x) = x^2 - 7, find (f+g) (x)

How many quarters and dimes of 80 coins make up 14.45

How do you make a number line

Three equivalent ratios for 8/10

a truck driver Drive 32 miles per hour it took 2 hours to travel between two towns what is the distance between the two towns. use the equation d=rt, where d is distance, r is rate, and t is time

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.