PLS HELP Find the value of x .

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

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.