Tan 12 degrees = 10/x

Benny bought 5 new trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 43 cards left. How many cards did Benny start with?

Give an example of an open equation? my answer is, x + 4 = 7 Until the value of x is found, it is unknown whether the equation is true or false. am i right?

Julien is planting a vegetable garden. The space that he has is 180 inches by 120 inches. He reads the plant package and sees that each seed needs 4 square inches of space.

How many 4'x8' sheets of plywood are required to cover a floor that is 9m by 16m?

Esther the Clown does face painting at the city carnival. She paints 7 faces every 21 minutes. Write an equation that relates the number of faces she paints (f) and time she spends painting (m) in minutes.

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.