Help me please

Find the amplitude of a sinusoidal function that models this temperature variation

What is the output, or dependent variable of quantity? 1: x 2: f(x) 3: y

Which two properties of equality could zoe use to finish solving for x? the equation is 3x - 4 = -10 for x so a either the addition or subtraction property of equalityb ether the multiplication or division property of equality c ether the addition or division property of equality d ether the subtraction or division property of equality just a simple a b c or d plz.