Question

Please help me with this

Answer 1

D=17-12.50 hope this helped

oh its the same as

d-12.50=17

Answer 2

So basically we're just looking for expressions equivalent to d - 12.50 = 17.
Let's look at each choice.

a.) d = 17 - 12.50
Try to make this look identical to d - 12.50 = 17

We can subtract 17 on both sides,
d = 17 - 12.50
- 17       - 17
We get:
d - 17 =  -12.50

Subtract d on both sides
- 17 = -d - 12.50
or 
-d - 12.50 = - 17 
Divide -1 on both sides to all terms:
d + 12.50 = 17

Comparing this to d - 12.50 = 17, they do not look identical.

On to b): d = 17 + 12.50

Subtract 12.50 on both sides,
d - 12.50 = 17

This looks exactly like d - 12.50 = 17 so b) is the correct answer! :D