House of Math Art A spotlight installed in the ground shines on the House of Math Art. A person stands between the light and the building casting a shadow on the building. How are the rate at which the person walks away from the light and rate at which their shadow grows related? One rate is a constant multiple of the other rate. The rates are equal. The rate changes based on how close the person is to the light.

If you travel 100 miles in two hours, then your average speed for the trip is Average speed=_________=________

Heart Disease In a certain country, the number of deaths due to heart disease decreased from 235 in one year to 221 in the next year. What percentage decrease in deaths due to heart disease does this represent?

Automobile collisions The energy dissipated in an auto mobile collision varies directly with the square of the speed. By what factor does the energy increase in a 50-mph collision compared with a 20-mph collision?