INPUT ARTICLE: Article: Make sure you are not using the x-coordinates, and that you are substituting the correct y-coordinates for the first and second points. For example, if the coordinates of your first point are (3,2){\displaystyle (3,2)}, and the coordinates of your second point are (7,8){\displaystyle (7,8)}, your formula will look like this:riserun=8−2x2−x1{\displaystyle {\frac {rise}{run}}={\frac {8-2}{x_{2}-x_{1}}}} Make sure you are not using the y-coordinates, and that you are substituting the correct x-coordinates for the first and second points. For example, if the coordinates of your first point are (3,2){\displaystyle (3,2)}, and the coordinates of your second point are (7,8){\displaystyle (7,8)}, your formula will look like this:riserun=8−27−3{\displaystyle {\frac {rise}{run}}={\frac {8-2}{7-3}}} This will give you your rise. For example, if your y-coordinates are 8{\displaystyle 8} and 2{\displaystyle 2}, you would calculate 8−2=6{\displaystyle 8-2=6}. This will give you your run. For example, if your x-coordinates are 7{\displaystyle 7} and 3{\displaystyle 3}, you would calculate 7−3=4{\displaystyle 7-3=4}. This result will give you the slope of your line.  For complete instructions on how to reduce a fraction, read Reduce Fractions. For example, 64{\displaystyle {\frac {6}{4}}} can be reduced to 32{\displaystyle {\frac {3}{2}}}, so the slope of a line through points (3,2){\displaystyle (3,2)} and (7,8){\displaystyle (7,8)} is 32{\displaystyle {\frac {3}{2}}}. A slope can be positive or negative. A line with a positive slope moves up left-to-right; a line with a negative slope moves down left-to-right.  Remember, if the numerator and denominator are both negative, then the negative signs cancel out, and the fraction (and slope) is positive. If either the numerator or the denominator is negative, then the fraction (and slope) is negative. To do this, look at the rise and run you calculated for your slope. Starting at your first point, count up the rise, then over the run. Repeat counting up the rise and over the run until you reach your second point. If you do not reach your second point, then your calculation is incorrect.

SUMMARY: Plug the y-coordinates into the slope formula. Plug the x-coordinates into the slope formula. Subtract the y-coordinates. Subtract the x-coordinates. Reduce the fraction if necessary. Be careful when working with negative numbers. Check your work.


INPUT ARTICLE: Article: Your amp should have a label near the speaker output jack that indicates the output power (measured in Watts) and the minimum impedance (measured in Ohms). Be sure that your use the values for bridged mode, it is usually double the minimum impedance as stereo mode (meaning you need a much high impedance to run a bridged system) and up to four times the power output. Your sub-woofers should also be labeled with an impedance value (in Ohms) and a value indicating the maximum power input that they can handle (in Watts). The majority of amps on the home theater market are only stable at 4 ohms when bridged. Most car stereo amplifiers can do 2 ohms. You should have at least four different values written down.  Amp Bridged Output Power Amp Bridged Minimum Impedance Speaker Power Rating Speaker Impedance To do this you should add together the speaker impedance number for all of your speakers. You want the impedance to be at least equal to the minimum impedance value of your amp on each channel, but not to exceed 16 Ohms unless your amp is specifically rated for impedance values above 16 Ohms.  The formula for finding total impedance for speakers wired in series is Z1 + Z2 + Z3 …. = Ztotal. Where Z is the impedance of a given speaker. For example, if you have three speakers with impedance values of 4 Ohms, 6 Ohms, and 8 Ohms your total impedance wired in series would be 18 Ohms (4+6+8=18). The formula for finding total impedance of speakers wired in parallel is a little trickier. It is (Z1 x Z2 x Z3…) / (Z1 + Z2 + Z3…) =Ztotal. So say you have two speakers with impedances of 6 Ohms and 8 Ohms. This time it would look like this: 1) Multiply the values. 6 x 8 = 48 Ohms 2) Add the values. 6 + 8 = 14 Ohms 3) Divide the top by the bottom to find your total impedance. 48/14 = 3.43 Ohms (rounded) You can also use an impedance calculator such as this one http://www.speakerimpedance.co.uk/. This will be based upon the total impedance and the power output of your amplifier. You can use variations of Ohm’s Law to do the calculations yourself or you can refer to the online calculator above. You do not want to overpower and blow your speakers. The output power should be stamped near the output jack on your amplifier and measured in Watts. You speakers should also be labeled with a wattage. The output wattage should meet or exceed the sum of all of your speakers. For example if you have two subs that each pull 200 W, you would want an amp that produces a minimum of 400 W. Ideally you would have an amp that produces more than what is required, this is referred to as "head room" and helps to avoid clipping. Wiring powered devices can be dangerous. If you are working on a car stereo system you can simply disconnect the battery terminals.

SUMMARY: Locate the specification labels for your system. Write down these values. Calculate the total impedance of all of your speakers. Calculate the power each speaker will receive. Verify that your amp has enough power for your subs. Unplug your equipment.


INPUT ARTICLE: Article: Broadleaf fertilizers will not work against foxtail since foxtail is a grass. If you want to use chemical control methods, you should look for an herbicide that can kill grasses. One of the most easily accessible types is a chemical called glyphosate. Glyphosate is a non-selective herbicide, so it will kill just about everything in the area you apply it in. For best results, spray the entire area with the glyphosate. Even though the other vegetation there will likely die, this is the quickest and most effective way of getting rid of fox tail. You will probably need to apply the herbicide two to three times, at minimum, before it wipes out the foxtail completely. Wait until after the foxtail reemerges before using another application. You should wait until two weeks or so pass before re-applying the herbicide, especially if using a potent one like glyphosate. While chemical herbicides can take care of the majority of the problem, enlisting the help of certain organic control methods can help in between applications, making the extermination process go quicker overall. Seven to ten days after you apply the herbicide, turn under the dead plant residue. If you plan to amend the soil, do so now.

SUMMARY:
Use glyphosate or similar products. Apply several times. Combine chemical herbicides with organic weed-control methods.