Who invented the current mathematical plus and minus signs?

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The likelihood is that the signs (+) and negative (-) derive from the associated math operations of addition (+) and subtraction (-) when performed on a null set (zero). The Welsh mathematician Robert Recorde (1510-1558), the designer of the equals (=) sign, introduced the modern use of plus and minus symbols to the UK in 1557. The Chinese worked with negative numbers as early as 200 AD, and mathematicians in India (either concurrently or later) used the (+) sign for negative numbers. Resistance to negative solutions was expressed by the Greeks, and later by Europeans as late as the year 1800. This seems hard to explain when we see that businesses routinely used "credits" and "debits" to their accounts during the entire period.
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Do two plus signs make a minus?

In addition and subtraction, if the plus sign is larger than theminus sign, then it's a plus. For example: +10 minus -20 = -10 If the plus sign is smaller than the minus sig

How is the plus and minus voltage sign for resistance voltage drops for battery voltages and currents be determined?

The plus and minus voltage sign for resistance voltage, drops for battery voltages, and drops for currents is determined by convention. You can use whatever method you want -

How do you type plus and minus signs?

The plus sign (+) should be at the top of your keyboard. If there is another symbol below it on the same key, then you need to hit "shift" and the "+" sign so it won't print t

Who invented minus sign?

No one invented the minus sign or at least none that we know of, it is simply part of the evolution of mathmatics. The minus sign we use appeared in the 1400s