What is the true solution to in 20+in 5=2 in x?

"true solution?"  

ln 20  +  ln 5  =  2 ln x can be re-written as

ln (20)(5)  = ln x^2.  We can drop the "ln" operator:

100=x^2                   which yields x=10 and x=-10.  The negative result must be discarded, since 2 ln (-10) is undefined.

x=10 (answer)  

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

c) 6

step-by-step explanation:

let pq = qr = rs = x, and xz = y and zu = z.

if the horizontal lines are parallel, then corresponding segments are in proportion:

substitute:

therefore 3 = y = z.

xu = y + z → xu = 3 + 3 = 6