To find the cost per grinder, divide the total cost, $900, by the number of grinders, 120; $900+ 120 = $7.50.

Note: m2 = sq. meter. The pebble walkway is acting like a border around the pool. There is now a larger rectangle around the pool with an additional 5 m on each side, 2.5 + 2.5 = 5. If you find the area of the larger rectangle and subtract away the area inside,
you are left with the area of the border. It is almost like cutting out the middle of the big rectangle. The area of the large rectangle is: 3,400 m2, |xw = A, 85x40 = 3,400. The area of the pool is only 2,800 m2,80 x 35 = 2,800. Subtract the two areas to find that the is 600 m2,3,400-2,800 = 600.

1. Convert feet to inches. Multiply 18' x 12" = 216"
2. Divide by 12" o.c.
216" / 12 = 18
3. Add 1 (for the end)
18 + 1 = 19

Replace w with 14 since the package weighs 14 ounces over 2 pounds. The formula is then $C = $2.95+$0.30 x 14. The order of operations states that multiplication is always done before addition. Multiply $0.30 by 14; $0.30 x 14 = $4.20, then add the result to $2.95; $2.95+$4.20 = $7.15.

There are 1,000 milliliters in 1 liter. To calculate how many liters 174 milliliters are, divide 174 by 1,000; 174 mL/1,000 mL/L= 0.174 L.

1. Calculate the material costs and labor savings for Type A Doors.
$400 x 6 = $2,400: material cost $20 x 6 = $120: labor savings
2. Calculate the material costs for Type B Doors.
$180 x 6 = $1,080: material cost
3. Calculate the total savings for Type A over Type B doors.
a. Subtract the labor from the material costs for Type A doors.
$2,400 - $120 = $2,280
b. Subtract the cost of Type B doors from Type A doors.
$2,280 – $1,080 = $1,200

The invoice weighs 4.2 oz. The first ounce is covered in the initial charge of $.37 and the rest of the 3.2 ounces must be calculated with the additional charge. For postage they round up to the next ounce so the 3.2 ounces rounds up to 4 ounces. An additional 4 ounces will cost $.92, 4 x $.23 = $.92. The total cost is $.37 + $.92 = $1.29.

Firstfind the number of tractors that will have a discounted price,2/3 of the 291 tractors is 194, 2/3 x 291 = 194.

Figure out the subtotal cost of the two hand saws;
$37.50 x 2 = $75.
To calculate the tax, translate_____is 8% of $75 into an equation:
y = .08 x $75. Solve y = $6 which represents the 8% tax. In order to find the total cost of the sweaters, add the 8% tax, $6, to the original price, $75;
$75 +$6 = $81.
To figure out the customer's change, subtract the total, $81, from the amount of cash given, $100;
$100-$81 = $19 change.

In order to find out how many hours she worked, divide the total amount paid by the hourly wage, 90/15 = 6; 6 hours.

The total surface area is 1,350 sq. cm. Find the surface area ofone side and then multiply by six because a cube has six equal
faces. The surface area of one side is 225,

15(2) = 15x 15 = 225, for a total of 1,350,6 x 225 = 1,350.

Find out how many rooms Lacey can clean in one hour and add it together with how many rooms Maria can clean in one hour. The total time to clean is 1 hour = 60 minutes.

Lacey can clean 4.29 rooms, 6844 = 4.29.

Maria can clean 3.16 rooms, 684a = 3.16.

When you add their efforts together they can clean 7.45 rooms, but because it asks for complete rooms, you must round down to 7 rooms.

The total number of pieces can be represented, 6x + 3x +x = 1,400 because of the ratio that is held. 6x represents the number of 6-foot pieces, 3x represents the number of 6-foot pieces, and x represents the number of 12-foot
pieces. Combine like terms to get, 10x = 1,400, sox = 140.
Therefore, there are 3(140) = 420 eight-foot pieces.

The cost of a phone call is ten cents plus four cents multiplied by one less than the total number of minutes (the first minute costs ten cents, so it is not multiplied by four cents). This translates into 10 + 4(m -1); m -1 is in parentheses because it must be calculated before multiplying by four cents.

One package and 16 individual switches costs $49.70, $26.50 +16($1.45) = $26.50 +$23.20 = $49.70.
The first option, 2 packages, costs $53.00,2 x $26.50 = $53. Purchasing 36 individual switches is not economical and costs ’ $52.20,36 x $1.45 = $52.20. The last option has too many switches and also costs more, 20 x $1.45 + $26.50 = $29 + $26.50 = $55.50.