Kevin has 18 coins in his penny jar inside he had 9 quarters 4 dimes 2 nickels and the rest were pennies if he randomly selected one from the jar and without replacing it select another one what is the probability that both coins selected were pennies

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).

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c