Which postulate or theorem proves that these two triangles are congruent? asa congruence postulate sas congruence postulate hl congruence theorem aas congruence theorem

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).

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years