Devesh

I need help doing the concert web summary on the types of preservation

/*At t=4.2 second mass will be MAXIMUM*/ Because at maxima slope needs to be zero and for this equation slope is zero (i.e horizontal to x axis when we plot graph of m(on y axis) vs t(on x axis)) at t=4.2seconds. You can do dm/dx and put it equal to zero...

Second part is easy just put t=4.2 in question. Last part can be found by putting respective time values as asked in question into equation of dm/dt

Plot graph of 5x^0.8 - 3x + 20 = y (similar equation) on *DESMOS*(graph plot app/site) and zoom into1st quadrant(cuz we only have to check corresponding mass values for only positive values of time) and you will find Maxima at 4.2 second.

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