The country a consumer price index is approximated by the following formula, where t represents the number of years after 1990.
a(t)=100e^0.023t
for instance, since a(16) is about 144, the amount of goods that could be purchased for $100 in 1990 cost about $144 in 2006. use the function to determine the year during which costs will be 90% higher than in 1990.

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

To prove that def ~ gfh by the sss similarity theorem using the information provided in the diagram, it would be enough additional information to know that

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t