The value of a car decreases exponentially over time. If the initial value is $20,000 and it depreciates by 15% each year, what will be its value after 2 years?

Nếu \( x = 9 \), tính giá trị của \( \sqrt{x} \) và \( \sqrt[3]{x} \).

In a stack of red and blue T-shirts, blue T-shirts and red T-shirts are in the ratio \( 4: 3 \). If then are 49 T-shirts, find the ratio of blue \( T \)-shirts to the total number of T-shirts-

3 The middle proportional between the two numbers 3 and 12 is ............. \( \begin{array}{llll}\text { (a) } \pm 3 & \text { (b) } \pm 4 & \text { (c) } \pm 6 & \text { (d) } \pm 12\end{array} \)

Given: \[ \begin{array}{l}f(x)=x-5 \quad g(x)=\left\lceil\frac{x}{6}\right\rceil \\ (f \circ g)(4)=\text { Ex: } 15\end{array} \]

\( \sqrt{2+\sqrt{3}}+\sqrt{2-\sqrt{3}} \) is