In the equation y = -10.35 sin(b), the amplitude is the coefficient of the sine function, which is 10.35.
In general, the equation of a sinusoidal wave can be represented as:
y = A * sin(bx + c)
where: A is the amplitude, b is the frequency, x is the variable representing the position along the wave, and c is the phase shift (an optional term).
In your given equation y = -10.35 sin(b), the frequency (b) and the phase shift (c) are not explicitly provided. Therefore, without more information or values for b and c, we can only identify the amplitude, which is 10.35.