Answer:
Answer would be x=1.
Step-by-step explanation:
4d+24
The distributive property says that 4(d+6)=4d+(4)(6)
which simplifies to 4d+24
(I hope that's what you needed, please lmk if you needed more than just simplifying.)
(a) Option B $20
(b) 100 miles Option B
and 
is 
.
.