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# Unit 2 post assessment

## on Oct 29, 2012

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## Unit 2 post assessmentPresentation Transcript

• Unit 2 Post Assessment Missed Problems
• Question 1Solve for x: 3x = 30 Multiplication is the operation being performed on the3x = 30 variable (x) so we need to undo multiplication by3x/3 = 30/3 dividing each side of the equation by 3.x = 10 Check your equation! 3(10) 30
• Question 2Solve for a: -2a = 16 Multiplication is the operation being performed on the-2a = 16 variable (a) so we need to undo multiplication by-2a/-2 = 16/-2 dividing each side of the equation by -2.a = -8 Check your equation! -2(-8) 16
• Question 5Solve for d: d – 12 = 10 Subtraction is the operation being performed on thed – 12 = 10 variable (d) so we need to undo subtraction by addingd – 12 + 12 = 10 + 12 each side of the equation by 12d = 22 Check your equation! 22 – 12 10
• Question 6Solve for f: f – 1.5 = 3.5 Subtraction is the operation being performed on thef – 1.5 = 3.5 variable (f) so we need to undo subtraction by addingf – 1.5 + 1.5 = 3.5 + 1.5 each side of the equation by 1.5f=5 Check your equation! 5 – 1.5 3.5
• Question 7Solve for t: 3 + t = 17 Addition is the operation being performed on the3 + t = 17 variable (t) so we need to undo addition by subtracting3 + t – 3 = 17 – 3 each side of the equation by 3.t = 14 Check your equation! 3 + 14 17
• Question 9Solve for l: s = l + w Addition is the operation being performed between ls=l+w and w so we need to subtract w to the other side to get ls–w=l+w–w alone.s–w=l
• Question 11Tenisha is twice as tall as her little brother. If Tenisha is 60 inches tall, how old is her little brother? Brother’s height is ½ of Tenisha’s 60/2 is 30 so Tenisha’s little brother is 30 inches tall.
• Question 12You and Michael have a total of \$19.75. IfMichael has \$8.25, how much money do youhave.You + Michael = \$19.75You + \$8.25 = \$19.75Subtract \$8.25 on each side.You = \$11.50
• Question 13Solve for x: 7x – 10 = 10 This is a two-step equation. We are multiplying 7 to the7x – 10 = 10 variable and subtraction 10 so we need to undo these7x – 10 + 10 = 10 + 10 two operations.7x = 20 Step 1: Undo subtraction by adding7x/7 = 20/7 Add 10 to each sidex = 20/7 Step 2: Undo multiplication by dividing Divide by 7 on each side.
• Question 14At the grocery store you This is a two-step equation.purchase 2 gallons of milk We are multiplying 2 to theand loaf of bread. You spent variable and adding 2 so wea total of \$8. If you know a need to undo these twoloaf of bread costs \$2, how operations.much does a gallon of milkcost? Step 1: Undo addition by subtracting 2 on each side2x + 2 = 8 Step 2: Undo multiplication by2x = 6 dividing by 2 on each side.x=3
• Question 16Solve for a: 4a + a – 11 = 24 Multiple Step Equation4a + a – 11 = 24 1) Combine like terms5a – 11 = 24 4a + a = 5a5a = 35 2) Add 11 to each side.a=7 3) Divide by 5 on each side.
• Question 17Solve for y: 4x – 8y = 16 Multiple Step Equation4x – 8y = 16 Subtract 4x on each side.-8y = -4x + 16 Divide by -8 on each side.y=½x–2
• Question 18Solve for p: 6p + 2(p – 1) = 22 Multiple Step Equation6p + 2(p – 1) = 22 1) Distribute 26p + 2p – 2 = 22 2) Combine like terms 6p + 2p8p – 2 = 22 3) Add 2 to each side8p = 24 4) Divide by 8 on each side.p=3
• Question 19Solve for r: 5 + 7r + 3r = 8(r – 4) Multiple Step Equation5 + 7r + 3r = 8(r – 4) 1) Distribute 85 + 7r + 3r = 8r – 32 2) Combine like terms 7r + 3r5 + 10r = 8r – 32 3) Subtract 8r to each side5 + 2r = -32 4) Subtract 5 on each side.2r = -37r = -37/2
• Question 20Solve for n: 3(n -2) + 1 = n + 4 + 2n Multiple Step Equation3(n – 2) + 1 = n + 4 + 2n 1) Distribute 33n – 6 + 1 = n + 4 + 2n 2) Combine like terms3n – 5 = 3n + 4 3) Subtract 3n on each side-5 = 4 -5 does not equal 4 so this equation does not have aNo Solution solution!