(91/3+42/3)/7-(-12)

plzzz help me with this

Write two subtraction equations that are equivalent to 5 + 12 = 17.

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

Does the point (1, sqrt 7) lie on circle shown.