Answer:

Step-by-step explanation:
given
45 = 25m + b ( isolate the term in m by subtracting b from both sides )
45 - b = 25m ← divide both sides by 25
= m
If you take 3.5 and divide it by 0.05, or times 20, that would make it 70.
The second one is the right answer
Answer:
see explanation
Step-by-step explanation:
Given

= 
= 
Rationalise the denominator by multiplying the numerator/ denominator by 
Note that
×
= a
=
× 
= 
Here is the answer. Addition of fraction sometimes needs L.C.M. (Lowest Common Multiple)