The following graphs have a scale assigned to them: The area of each grid
square is 0.1 sq. units. Which ones are not density curves for a continuous
random variable?
Check all that apply.

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 quadratic function h(t)=-16.1t^2+150 choose the graph representation

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)