The line with equation y
=
2
x
+
3
is reflected in the
x
-axis.

Which of the following is the equation of the new line?

a) y = 2x + 3
b) y = -2x + 3
c) y = 2y + 3
d) y = 1/2 x + 3
e) y = -2x -3

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

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 is sin 7x/4 ? i need on this urgent trig