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(e) Plugging in t = 7.92 into the equation x = -3.3 * cos(1.88 * t), we get x = -3.3 * cos(1.88 * 7.92) ≈ -1.4 cm.
(f) The toy is at a position of approximately -1.4 cm at t = 7.92 seconds. This means that the toy is below the water at this time. To determine this, we look at the amplitude of the cosine function in the equation given (-3.3). Since the amplitude represents how far the toy goes above and below the water level, the fact that the toy is at -1.4 cm means it is below the water (as the water level is at 0 cm).