what expression should be substituted for y in the equation 5x+2y=25 to solve the system of equations?

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

The graph shown is the graph of which function?

Math each whole number with a rational, exponential expression