HELP ME ASAP. When are supplementary angles congruent?

always
if they are right angles
if they are acute angles
never

Suppose investors can earn a return of 2% per 6 months on a treasury note with 6 months remaining until maturity. the face value of the t-bill is $10,000. what price would you expect a 6-month maturity treasury bill to sell for? (round your answer to 2 decimal places. omit the "$" sign in your response.)

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?