I cant add mixed fractions with whole numbers

An aquarium has a length of 20 inches, a width of 10 inches, and a height of 18 inches. The directions tell you to fill the aquarium until you have a 2-inch gap between the top of the water level and the top of the aquarium.

Find the cost of a 19,500 car plus a 6% sales tax

Solve for x: -2x (x-3) = - 11 (correct two decimal place)

Which equation represents a line which is parallel to the line y=7/4x-3

What the answer to 6 (3j+4+2j)

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.