Answer:
I think it's 20
Step-by-step explanation:
On both sides of the equal sign you subtract b (-b) which would give you -b+y=2x after that you subtract a y (-y) which gives you -b=2x-y now I was taught that you can't have a negative letter equal something so you change all of the signs to the opposite which would give you b=-2x+y
Solve the system if equations by subtracting:
We get 5L = 45
L = 9
Substituting for L in s = 20L + 75 gives s = 255
So the second choice I the correct one
Answer:
We can go step by step for this problem by listing out how many blocks for each stack.
Stack 1: 4
Stack 2: 4+9=13
Stack 3: 13+4=17
Now we can sum up the number of blocks in each stack to get 4+13+17=34. The answer is 34.
