im am pretty sure it is b.sometimes because an equation can have more then one answer
Step-by-step explanation:

from difference of two squares:

therefore:

factorise out ¾ :

Answer:
Answer is 6
Step-by-step explanation:
So the greatest common factor 36 and 42 is 6.
I hope it's helpful!!
Answer:

Step-by-step explanation:
Recall the Exponent Law:

Solution:

Usual distance michiko runs= d miles
Time=t
normal speed= r₀
speed today= r₁
According to the question,
r₀= d/t
r₁= d+9/t+70.