Billy can do 4 hours which is 1000 pictures
and Sandy 3 1/15 hours 500 pictures and 1/15 is 50.
Let me know if I'm wrong
Hope this helps
I think the expression that you need is, 4-(2x). Hope it helps!
Answer:

Step-by-step explanation:

Add 18 to both sides:


Subtract 9h from both sides:


Multiply both sides by -1 and flip the symbol:


Divide both sides by 2:


Answer:
The answer is <u>54.6</u>.
9.1(6)+8.7(7)=<u>54.6</u>+60.9
Step-by-step explanation:
Given:
9.1(6)+8.7(7)=_+60.9
Now, to solve it:
9.1(6)+8.7(7)=_+60.9
Let the _be x.
So, we remove parenthesis first that makes it multiply with the number next to it:


Now adding on L.H.S:

Subtracting on both sides by 60.9 we get:


Therefore, the answer is 54.6.