Name the theorem or postulate that can be used to prove that these triangles are similar

Do 12/14 and 8/10 have the same value? explain your answer.

Through: (-3,-3) parallel to y= 7/3x+3

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