Which functions are even? Check all of the boxes that apply. f(x)=x*- x?
f(x) = x+ - 3x + 2
10) VG-2)
f(x) = |x|

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

Answer! if you don’t mind, can you explain

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /