Explain why multiplying the numerator and denominator of a fraction by the same number results in an equialent fraction

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

Which answer goes into the box? (90° clockwise rotation, 90° counter clockwise rotation, translation, or glide reflection)

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)