An expression is shown (2x-x^2-2)-(6x+x^2-3)
which choice shows an equivalent expression
a. -4x^2+2x-1
b. -2x^2+4x+1
c.-4x^2-2x+1
d. -2x^2-4x+1

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

the answer is 11.2 (i know i’m late)

sounds & other waves originate from any vibrating object

i think the answer is c sorry if it's wrong