The answer is K= 7 because
-5-7=-12
Think of thermometer the negative degrees are the coldest so are the lowest on the vertical column
first convert -14 1/5 to decimals = -14.2
so the order is
-14.4 , -14 1/5 , -14.

=

Multiply both sides by 15
6 =

Multiply both sides by c
6c = 30 Divide both sides by 6
c = 5
No you could have left it as the last but one line or write them separately as
11/18 + √85 / 18 , 11/18 - √85/18
1.69 is 1.3 to the second power