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To add 3 and 5 on your calculator, start off by making sure all is clear with no numbers showing in the display. Push the 3 key, then push the + key, then push the 5 key, then push = . The answer should appear. To subtract repeat the above process but push the minus (-) key in place of the + key. If you subtract 5 from 3 you will get a negative (-) number 2. Does this solve your problem? If not, ask your question again but in a different way.
It depends on how you connect the batteries. If you connect the negative of battery one to the positive of battery 2, the negative of battery 2 to the positive of battery 3 the negative of battery 3 to the positive of battery 4 then the positive of battery 1 and the negative of battery 4 will give you 48v 7AH. (This is known as connecting in series.)
If you connect the four positives together. Connect the 4 negatives together it will give you 12v 28 AH. (This is known as parallel connection.)
If you connect the negative of battery 1 to the positive of battery 2. Connect the negative of battery 3 to the positive of battery 4. Connect the positive of battery 1 to the positive of battery 3 and the negative of battery 2 to the negative of battery 4. You'll get 24v 14AH from the connection of the positive of battery 1 and battery 3, and the negative of battery 2 to battery 4. (This is known as series parallel connection)
Ok so first you need to find what x equals in terms of y. so use the first equation .2x+.7y=1.5 solve for x by the following steps subract .7y from both sides: .2x= 1.5-.7y ---> divide by .2 on both sides: x= 7.5 - 3.5y. ---> Now plug in x= 7.5 - 3.5y for x in the second equation 0.3 (7.5 - 3.5y) -0.2y=1 ---> Distribute the .3: 2.25 - 1.05y -.2y = 1---> solve for y by combining like terms (the y's) and subtractive 2.25: -1.25y = -1.25---> divide by -1.25 and you get y= 1 Now go back to your x= 7.5 - 3.5y you solved for. Plug in 1 for y in the equation and solve for x---> x=7.5-3.5(1) so x= 4 and y=1 yay your done!
The same way you'd work with positive exponents. The only difference is that a negative exponent has a negative sign, entered with the (-) key just to the right of the decimal point.
The (-) is used to enter negative numbers, not just exponents. The - key is used to subract one value from another.
Use the parenthesis above the 8 and 9 keys. Don't use the curly braces on those shifted keys (those are for lists) nor the square brackets on the multiply and subract keys (those are for arrays).
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