We know that Step 1 is correct, because it is just a restatement of the equation. Therefore, we can eliminate Step 1:
2(5y – 2) = 12 + 6y
In Step 2, the student tried using the Distributive Property. The Distributive Property can be written as one of the two following formulas:
a(b + c) = ab + ac
a(b – c) = ab – ac
In this case, we'll use the second formula. Substitute any known values into the equation above and simplify:
2(5y – 2) = 2(5y) – 2(2)
2(5y – 2) = 10y – 4
In Step 2, the student calculated 2(5y – 2) to equal 7y – 4. However, we have just proven that 2(5y – 2) is equal to 10y – 4.
The student first made an error in Step 2, and the correct step is:
Step 2: 10y – 4 = 12 + 6y
I hope this helps!
Each day the amount increases by $32 and at days=0 he had $80 so:
b. Joseph has $80 in his bank account and earns $32 each day.
Answer:
C 110.25
Step-by-step explanation:
Answer: plus or minus 1, 1/2, 2, 5, 5/2, and 10
Explanation:
To find the possible roots
We first find the factor of the constant term:
10: 1, 2, 5, 10
Then we find the factor of leading coefficient:
2: 1, 2
And the possible rational roots are:
Plus or minus [1/1, 1/2, 2/1, 2/2, 5/1, 5/2, 10/1, 10/2]
Then we get rid of the duplicate:
Plus or minus [1, 1/2, 2, 5, 5/2, 10]
33.3333333333333333333333333333333333333333333333333333333333333333 comes close, but there is no whole number * 3 that = 100
