Daily menu for maths

My quiz had 15 questions, I got a score of 67.8%. how many questions did I get wrong?

Be sure to answer all parts. the area of a telescope lens is 6.490 * 103 mm2. (a) what is the area in square feet (ft2) ? enter your answer in scientific notation.

Suppose an investment of $3,800 doubles in value every decade. The function f (x) = 3,800·2x f (x) = 3, 800 · 2 x gives the value of the investment after x decades. How much is the investment worth after 2 decades?

The teenage market is a market that is categorized in what way? a. By commodity b. By price c. By location d. By consumer

How do you write 120% as a fraction or mixed number in simplest form?

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.