Part A: What is the area and perimeter of the base of the pyramid? Show all work. Part B: What is the value of I to nearest tenth? Show all work. Part 2: What is the surface area of the pyramid, rounded to the nearest tenth? Show all​

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).

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1