- A tri-axle truck typically holds 11 yards of concrete. - A dry yard weighs 3,500 pounds A standard conrete mix uses 500 pounds of cement.
- 1,200 pounds of sand, and 1,800 pounds of gravel or crushed stone. 3,000 grade concrete for sidewalks is $82.00 per cubic yard.
- 3,500 grade conrete for driveways is $83.50 per cubic yard. - Gravel is 1.4 tons per cubic yard.
- One gallon of water weighs 8.35 pounds, and there are 7.48 gallons in a cubic foot.

1. How much concrete would you need for a driveway that is 10 ft by 45 ft and 9 inches deep?

2. How many truckloads would be required to transport the material in #1.

Browning labs is testing a new growth inhibitor for a certain type of bacteria. the bacteria naturally grows exponentially each hour at a rate of 6.2%. the researchers know that the inhibitor will make the growth rate of the bacteria less than or equal to its natural growth rate. the sample currently contains 100 bacteria.the container holding the sample can hold only 300 bacteria, after which the sample will no longer grow. however, the researchers are increasing the size of the container at a constant rate allowing the container to hold 100 more bacteria each hour. they would like to determine the possible number of bacteria in the container over time.create a system of inequalities to model the situation above, and use it to determine how many of the solutions are viable.

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2