12.6 ...if it was rounded, it was rounded to the nearest tenths.....because ur 6 is in the tenths place
if it was 12.67 rounded, then it would have been rounded to the nearest hundredths place because ur last digit is in the hundredths place
and if it was 12.678 rounded, then it would have been rounded to the nearest thousandths place because ur last number is in the thousandths place
u get it ?
Answer:
The cost of the $0.5 per cookies and $1.25 per brownie.
Option (A) is correct.
Step-by-step explanation:
Let us assume that the cost of the cookies =x
Let us assume that the cost of the brownie = y
As given
Sara is selling cookies and brownies as a fundraiser for the school band.
She charges $2.25 for two cookies and one brownie.
Than the equation becomes
2x + y = 2.25
She charges $5.75 for four cookies and three brownies.
4x + 3y = 5.75
Than two equation are
2x + y = 2.25 and 4x + 3y = 5.75
Multiply 2x + y = 2.25 by 3 and subtracted from 4x + 3y = 5.75
4x - 6x + 3y - 3y = 5.75 - 6.75
-2x = - 1
2x = 1

x = $0.5
Put in the equation 2x + y = 2.25
2 × 0.5 + y = 2.25
1 + y = 2.25
y = 2.25 - 1
y = $1.25
Therefore the cost of the $0.5 per cookies and $1.25 per brownie.
Option (A) is correct.
Answer:

Step-by-step explanation:
Step 1: Write out equation
a(t + z) = 45z + 67
Step 2: Distribute <em>a</em>
at + az = 45z + 67
Step 3: Subtract 67 on both sides
at + az - 67 = 45z
Step 4: Subtract az on both sides
at - 67 = 45z + az
Step 5: Factor out <em>z</em>
at - 67 = z(45 + a)
Step 6: Divide both sides by 45 + <em>a</em>

Answer:

Step-by-step explanation:
Let:

This allows us to manipulate the equations like we normally would.

Then, we return the values where they belong.

Finally, we add:
