For the following true conditional statement, write the converse. if the converse is also true, combine the statements as a biconditional.

if x = 9, then x2 = 81.

a)if x2 = 81, then x = 9.
b)if x2 = 81, then x = 9.
x2 = 81 if and only if x = 9.
c)if x2 = 9, then x = 81.
d)if x2 = 81, then x = 9.
x = 9 if and only if x2 = 81

Harold wrote this equation to model the level of water in a pool over time. the variable x represents time in hours. f(x) = 3,500 - 225x which statements about the situation are true? check all that apply. the water level is rising. the water level is falling. the initial level of water in the pool was 3,500 units. the initial level of water in the pool was 225 units. the pool was empty after 14 hours. the water was 2,600 units high after 4 hours.