Answer:
His answer is wrong.
Step-by-step explanation:
-4(6-R)=12 <-- Since R is negative, -4 times -R results in a positive so, 4R.
-24+4R=12
+24 +24
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4R = 36
R= 9
Current density of solution a/m2 is given below
Step-by-step explanation:
Current density is the measure of current generated per unit surface area of electrode.
Eg: In microbial fuel cell/fuel cells, if you are using electrode with size of 5cm x 2cm and current produced is 200mA, then current density will be,
CD= Current/(projected area of electrode)
area of rectangle= LxB= 5cm x 2cm =10cm2
CD= 200mA/10cm2
CD= 20mA/cm2
Your Current will be 200mA.
Current density will be 20mA/cm2.
6mph+(-2mph)=5mph+11mph=16mph ser up a equation six miles per hour minus negetive 2 miles per hour gives you 5 miles per hour plus 11 miles per hour gives you 16 miles per hour
solve for the indicated variable means isolate that variable.
Ans(7)
P=IRT (T)
that means solve for T or make T alone on one side of equal.
To do that we just need to move IR on the left side
So we get:
Hence final answer will be 
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Ans(8)
2x-3y=8 (y)
-3y=8-2x
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Ans(9)
V=LWH (L)
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Ans(10)
A=2(L+W) (w)
A=2L+2W
A-2L=2W
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Ans(11)
ax+by=c (y)
by=c-ax
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Ans(12)
(R)
PN=R-C
PN+C=R
R=PN+C
