Q: Before you use your vacuum pump, make sure it is full of clean vacuum pump oil. Unscrew the oil fill cap, typically located on the top of the pump, and look on the interior edge of the opening for the fill line. Fill the opening with oil until it reaches that line. Then, replace the oil fill cap. Be sure to only use oil meant for vacuum pumps. Using other mechanical oils could impact the quality and performance of your vacuum. You will need a gauge set that connects to both your vacuum and your pressure ports on your AC system. The blue gauge and hose should connect to the low-pressure service port. The red gauge and hose will connect to the high-pressure port. The yellow hose in the middle should connect your gauges to your vacuum. Make sure the gauges and gauge hoses are connected tightly. Loose seals can compromise your vacuum. In your car, your high-pressure port will generally be physically higher than the low-pressure port. Once you have your gauges in place, you will need to use the valves on your AC system that opens and closes the service port to the refrigerant lines. With the valves closed, your gauges should have little to no pressure reading.
A: Fill the pump with vacuum oil. Attach your gauges to the ports. Open your manifold valves.

Q: Using the explicit formula and some basic algebra, you can find several pieces of information about an arithmetic sequence. In its original form, a(n)=a(1)+(n1)d{\displaystyle a(n)=a(1)+(n-1)d}, the explicit formula is designed to solve for an and give you the nth term of a sequence. However, you can algebraically manipulate this formula and solve for any of the variables. For example, suppose you have the end of a list of numbers, but you need to know what the beginning of the sequence was. You can rearrange the formula to give you a(1)=(n1)da(n).{\displaystyle a(1)=(n-1)d-a(n).} If you know the starting point of an arithmetic sequence and its ending point, but you need to know how many terms are in the list, you can rearrange the explicit formula to solve for n. This would be n=a(n)a(1)d+1{\displaystyle n={
rac {a(n)-a(1)}{d}}+1}. If you need to review the basic rules of algebra to create this result, check out Do Algebra or Simplify Algebraic Expressions. You may know that the 50th term of an arithmetic sequence is 300, and you know that the terms have been increasing by 7 (the "common difference"), but you want to find out what the first term of the sequence was. Use the revised explicit formula that solves for a1 to find your answer. Use the equation a(1)=(n1)da(n){\displaystyle a(1)=(n-1)d-a(n)}, and fill in the information that you know. Since you know that the 50th term is 300, then n=50, n-1=49 and a(n)=300. You also are given that the common difference, d, is 7. Therefore, the formula becomes a(1)=(49)(7)300{\displaystyle a(1)=(49)(7)-300}. This works out to 343300=43{\displaystyle 343-300=43}. The sequence that you have began at 43, and counted up by 7. Therefore, it looks like 43,50,57,64,71,78293,300. Suppose you know all about the start and end of an arithmetic sequence, but you need to find out how long it is. Use the revised formula n=a(n)a(1)d+1{\displaystyle n={
rac {a(n)-a(1)}{d}}+1}. Suppose you know that a given arithmetic sequence begins at 100 and increases by 13. You are also told that the final term is 2,856. To find the length of the sequence, use the terms a1=100, d=13, and a(n)=2856. Insert these terms into the formula to give n=285610013+1{\displaystyle n={
rac {2856-100}{13}}+1}. If you work this out, you get n=275613+1{\displaystyle n={
rac {2756}{13}}+1}, which equals 212+1, which is 213. There are 213 terms in that sequence. This sample sequence would look like 100, 113, 126, 139 2843, 2856.
A: Rearrange the explicit formula to solve for other variables. Find the first term of a sequence. Find the length of a sequence.

Q: Set a skillet with high sides on your stove top. Pour enough frying oil into the skillet so you only have 2-inches (5 cm) of space above the top of the oil. Turn the heat to medium-high. If you're using a thermometer, attach it to the side. You can use your favorite frying oil, shortening, lard or rendered animal fat. Avoid using olive oil or extra-virgin olive oil because it will burn. Place a baking sheet next to your stove top and put a metal wire rack or draining rack on the sheet. Ensure that there's at least 1-inch (2.5 cm) of space between the rack and the sheet. You'll be able to drain the broasted potatoes on the rack which will help keep them crispy. Get out 1/2 to 1 pound (225 g to 450 g) of Russet potatoes, but do not wash them. Instead, use a vegetable peeler to peel the potatoes. Use a paper towel to wipe the potatoes off. Carefully slice the potatoes into thick slices about 1/2-inch (12 mm) wide. The slices should be the size of large French fries or wedges. You want to avoid getting the potatoes wet because moisture will prevent the potatoes from crisping up. Pour 1 cup (240 ml) of cold water into the bowl of your electric pressure cooker. Add 1 teaspoon of coarse kosher salt and teaspoon of baking soda. Stir the brine to dissolve the salt and baking powder. Put a trivet or vegetable steamer basket into the bottom of the pressure cooker with the brine. Lay the sliced potatoes in the steamer so they're in an even, single layer. Avoid overcrowding the steamer basket or the potatoes won't become crispy. You can always make more broasted potatoes in batches.
A: Heat oil in a deep skillet. Set up a draining rack. Peel and slice the potatoes. Combine brine in a pressure cooker bowl. Arrange the potatoes in a steamer in the pressure cooker.

Q: All of the chemical products used to treat poplar can be hazardous, so you should always wear rubber gloves and a respirator. Also wear the respirator while sanding to avoid breathing in wood particles. Ventilate your workspace by keeping an air current flowing through it. To ventilate the area, open any nearby doors or windows. You can also make use of fans or work outside. You can purchase a respirator at most general stores and hardware stores. Rub the coarse-grit sandpaper over all the areas you wish to stain. The sandpaper roughs up the wood, which allows the staining products to sink further into the grain. Always wipe along the grain. Look closely at the wood to see which direction its particles are oriented towards. The grain looks like lines in the wood. After roughing up the wood, even it out with a finer grit sandpaper. Go back over all the areas you sanded earlier. Blow the wood shavings off the poplar when you're finished. Make sure the wood looks and feels even before you attempt to stain it.
A:
Wear protective clothing and work in a well-ventilated area. Abrade the poplar with 80-grit sandpaper. Smooth out the wood with 180 to 220-grit sandpaper.