91Ó°ÊÓ

The area A of a trapezoid with parallel bases of lengths \(b_{1}\) and \(b_{2}\) and height \(h\) is \(A=\frac{1}{2} h\left(b_{1}+b_{2}\right)\) Find the area of a trapezoid whose height is 2 meters and whose bases are 6 meters and 10 meters. (GRAPH CANNOT COPY)

Evaluate the expression. \(2 s^{3}-3 t\) when \(s=4\) and \(t=6\)

$$ \frac{2}{5}-\frac{1}{10} $$

The science club is selling magazine subscriptions at \(\$ 15\) each. The club wants to raise \(\$ 315\) for science equipment. How many subscriptions does the science club need to sell to raise \(\$ 315 ?\)

Use a calculator to evaluate the power. For keystroke help see Student Help box on page 11. $$ 6^{8} $$

Use the following information. The surface area of a cylinder equals the lateral surface area \((2 \pi r \cdot h)\) plus the area of the two bases \(\left(2 \cdot \pi r^{2}\right)\). Write the expression for the surface area of a cylinder.

CHECKING SOLUTIONS OF INEQUALTTIES Check whether the given number is a solution of the inequality. $$\frac{25-d}{d} \geq 4 ; 5$$

Check whether the number is a solution of the equation or the inequality. \(7 y+2=4 y+8 ; 2\)

$$ 2 \frac{1}{5} \div \frac{4}{5} $$

Use the following information. The surface area of a cylinder equals the lateral surface area \((2 \pi r \cdot h)\) plus the area of the two bases \(\left(2 \cdot \pi r^{2}\right)\). Evaluate the expression when \(h=10.5\) centimeters and \(r=2.5\) centimeters. Use 3.14 as an approximation for \(\pi .\)