Aseries circuit has two 5.0-ohm resistors and a power source of 9.0 volts. how will the current be affected and what will it be if another resistor (with a resistance of 7.5 ohms) is added to the circuit?
a. increase; 0.51 amps
b. increase; 0.72 amps
c. increase; 3.6 amps
d. decrease; 0.51 amps
e. decrease; 0.72 amps

The formula for solving current given with resistance and power source or voltage is shown below:
I = V/R  

When two 5 ohms resistors are in series, we have:
I = 9 volts / (5+5 ohms)
I = 0.9 amperes

When it is being added with another 7.5 resistors, we have:
I = 9 volts / (5+5+7.5 ohms)
I = 0.529 ampere

The answer to the question is the letter "D. decrease; 0.51 amps".

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

Ibelieve its because the stove is a cleaner burning fuel