The variable b varies directly as the square root of c. If b = 100 when c = 4, which equation can be used to find other combinations of b and c a. b=25c

b. b√c=50

c. b=200c

d. b=50√c

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.