4+3j=43
-4 from both sides
3j=39
then divide both sides by 3 to isolate j
j=12
It does not matter whether or not you have a d or a c to use for an unknown number, because you do not know what that number is. The letter does not abbreviate something, it's just a symbol to fill in the place of the missing number.<span />
540 is the answer because the doubled the first number to get the second number and multiplyed that by 3 to get the third number
7x/2 < 5
7x/2 * 2 < 5 * 2
7x < 10
7x71 < 10/7
x < 10/7
