Isabel wants to rent a boat and spend at most $39. The boat costs $6 per hour, and Isabel has a discount coupon for $3 off. What are the possible numbers of hours Isabel could rent the boat? Use t for the number of hours.
Write your answer as an inequality solved for t.

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.)

What are the coordinates of the hole in the graph of the function f(x) ? f(x)=x2−9x−3 enter your answer in the boxes.

Aregular hexagon rotates counterclockwise about its center. it turns through angles greater than 0° and less than or equal to 360°. at how many different angles will the hexagon map onto itself?