Algebra: Define the value of X: 12x + 0 = 144?

Questions

Traveling at a rate of 2 to 3 miles per hour, camels can carry 500 to 1,000 pounds on their backs. They are able to keep up this pace for 6 or 7 hours a day. Camels will refuse to carry loads that are not properly ----------?

The pronghorn ---------- can run up to 61 miles per hour.?

The flounder swims ----------?

Tuna swim at a steady rate of 9 miles per hour for an indefinite period of time - and they never stop moving. Estimates indicate that a 15-year-old tuna travels one million miles in its ----------?

The pronghorn ---------- is the fastest mammal to be found in North America, and second only to the cheetah as the fastest mammal on the planet.?