Which of the following relations is a function? A{(1, 3), (2, 3), (4,3), (9. 3)}

B{(1, 2), (1, 3), (1.4), (1,5)}

C{(5, 4), (-6, 5), (4, 5), (4, 0)}

D{(6,-1), (1, 4), (2, 3), (6, 1)}

What is the missing step in this proof ?

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Which expression is equivalent to (4 +6i)^2? ? -20 + 48i 8 + 12i 16 - 36i 20 + 48i