What is the nature of roots of 4x2 - 4x = -1 ? a. nonreal
b. real, rational, and equal
c. real, rational, and unequal
d. real, irrational, and unequal

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

The radius of a sphere is 3 inches. which represents the volume of the sphere?