The units digit of a perfect square is 6. what are the possible values of the tens digit?

If is a perfect square ends in 6,  the last digit squared must end in 6 as well.

The only single digit numbers squared that end in 6 are:    4*4=16   and   6*6=36  

They are the only 2 so the number that is being squared must end in 4 or 6

Let the second last digit be X.  X can be any digit.

So the last 2 digits of our number that is being squared are either   X6   or    X4

That is, the last 2 digits of the number are either (10X+6)   or   (10X+4),

this will result in X always being an odd number.

$3720

step-by-step explanation:

taxable income = $31000

as per the 2018-2019 us tax bracket, the tax rate is 12% for an individual whose taxable income is between $9,526 to $38,700.

so, the tax to be paid by him = 12% of 31000

= 0.12 * 31000     [12% converted to decimal as 0.12]

= $3720