Answer:
The school has 6 periods a day needs 1 hour for each.
Step-by-step explanation:
8 period =45×8=360 minute
6 perod =360/6=60minute
Answer:
(3, 2)
General Formulas and Concepts:
<u>Pre-Algebra</u>
- Order of Operations: BPEMDAS
- Equality Properties
<u>Algebra I</u>
- Solving systems of equations using substitution/elimination
- Solving systems of equations by graphing
Step-by-step explanation:
<u>Step 1: Define systems</u>
-3x + 10y = 11
-8x + 2y = -20
<u>Step 2: Rewrite systems</u>
-8x + 2y = -20
- Add 8x to both sides: 2y = 8x - 20
- Divide 2 on both sides: y = 4x - 10
<u>Step 3: Redefine systems</u>
-3x + 10y = 11
y = 4x - 10
<u>Step 4: Solve for </u><em><u>x</u></em>
<em>Substitution</em>
- Substitute in <em>y</em>: -3x + 10(4x - 10) = 11
- Distribute 10: -3x + 40x - 100 = 11
- Combine like terms: 37x - 100 = 11
- Add 100 to both sides: 37x = 111
- Divide 37 on both sides: x = 3
<u>Step 5: Solve for </u><em><u>y</u></em>
- Define original equation: -3x + 10y = 11
- Substitute in <em>x</em>: -3(3) + 10y = 11
- Multiply: -9 + 10y = 11
- Add 9 to both sides: 10y = 20
- Divide 10 on both sides: y = 2
<u>Step 6: Graph system</u>
<em>Check the system</em>.
39 over 9th as a repeating decimal is 4.33 ( the 3 keeps repeating )
I hope this helps!