1 point Round the following number to the nearest hundred. 11,649

2 points In the mid-20th century, engineers constructed a series of canals to move irrigation water from water sources to farming communities throughout the western United States. The volume of water a canal can move is partially dependent on its cross-sectional area. Suppose a canal is trapezoidal, 25.0 ft across the top and 15.0 ft across the bottom, with a planned depth of water of 10.0 ft as shown in the figure. Find the cross-sectional area of the canal when it is full (in ft2). (Use the rules for working with measurements give your answer to the appropriate accuracy and/or precision.)

1 point Round the following number to the nearest hundred. 10,649  

2 points Find the perimeter (in cm) and use Heron’s formula to find the area (in cm2) of the triangle. (Use the rules of working with measurements. Round the area to the same accuracy as the least accurate measurement. Round the perimeter to the same precision as the least precise measurement.)

3 points Using the figure below, solve the right triangle. (Round lengths of sides to four significant digits, in m, and angles to the nearest hundredth of a degree). a = 15.00 m, b = 27.55 m

1 point Find the circumference of a circle, whose diameter is 28 cm.  [Hint: Use  

1 point Express the ratio in the lowest terms.  The ratio must be expressed as whole numbers.

1 point Express the ratio in the lowest terms. 25 : 75

1 point Perform the indicated operations using the laws of exponents.  Express the result using a single non-negative exponent of 10.

1 point Perform the indicated operations.