63+12x<15
12x<-48 (subtract 63 from both sides)
x<-4 (divide out the 12)
8 days because 4/5 = 8/10 and he is using 1/10 a day.
Answer:

Step-by-step explanation:
hope that was the answer you were looking for :/
Answer:
The measure of the fourth angle = 137.1°
Step-by-step explanation:
Let x = the measure of the fourth angle
Sum of all 4 interior angles in a quadrilateral equal 360°
so
x + 23.5° + 99° + 100.4° = 360°
x + 222.9° = 360°
x = 360° - 222.9°
x = 137.1°