The main goal of developing technology is to

A)  

learn about the universe and the laws of nature.  

B)  

design new scientific instruments.  

C)  

make new inventions and processes to benefit humans.  

D)  

make new scientific discoveries.

I believe the correct answer is C, but I'm 100% on this.  Hope this helped though!

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave