Solve -0.9y*(-0.9)

$$- 0.9 y \cdot ( - 0.9 )$$

Differentiate w.r.t. y

$$0.81$$

Steps Using Definition of a Derivative

Multiply -0.9 and -0.9 to get 0.81.

$$\frac{\mathrm{d}}{\mathrm{d}y}(0.81y)$$

The derivative of ax^{n} is nax^{n-1}.

$$0.81y^{1-1}$$

Subtract 1 from 1.

$$0.81y^{0}$$

For any term t except 0, t^{0}=1.

$$0.81\times 1$$

For any term t, t\times 1=t and 1t=t.

$$0.81$$

Evaluate

$$\frac{81y}{100}$$

Solution Steps

Multiply -0.9 and -0.9 to get 0.81.

$$0.81y$$