One makes nine dollars per hour at his job the equation represents how much money he made yesterday t equals nine each if one makes t $76.50 yesterday how many hours did he work

What is the number 321,000,000 in scientific notation? also what is the number? ?

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota