If the radius of a circle is 10 feet, what is the diameter?

5 feet

20 feet

31.4 feet

100 feet

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

What is [tex] {7}^{98 + \sqrt{4} } - 3 \times (64 \div 2 + 4 - 36) \times a = a + 36[/tex]?

The sum of two numbers is 86, and their difference is 20. find the two numbers