-d would equal 3. just flip its around right?
3x-6+10x+15=35
10x+3x=35-15+6
13x=26
x=2
Answer:
distance covered in 2 hours = 80 km
distance covered in 1 hour = 80÷2 = 40 km
distance covered in 7/2 hours = 40 × 7/2
= 140 km
(3 1/2hours = 7/2 hours)
Sqrt of 144 = 12 so in other words your answer is 12
I would divide 15.26 by 4.36 then check it by multiplying 4.36 by the original answer