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PSAT/SAT Special Symbol Practice 1. x = 140 25 r = –1 E) 11 – a D) 20 B) 1 a = 36 27

PSAT/SAT Special Symbol Practice 1. x = 140 25 r = –1 E) 11 – a D) 20 B) 1 a = 36 27 10. xy = 125. Students are allowed to use their own calculators on the PSAT - scientific or graphing calculators are recommended. Students are not allowed to use the following, however:

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PSAT/SAT Special Symbol Practice 1. x = 140 25 r = –1 E) 11 – a D) 20 B) 1 a = 36 27

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  1. PSAT/SAT Special Symbol Practice • 1. • x = 140 • 25 • r = –1 • E) 11 – a • D) 20 • B) 1 • a = 36 • 27 • 10. xy = 125

  2. Students are allowed to use their own calculators on the PSAT - scientific or graphing calculators are recommended. Students are not allowed to use the following, however: 1. pocket organizers 2. laptops and handheld devices 3. cell phone calculators 4. calculators with a QWERTY keypad 5. calculators that require an electrical outlet Also, students can't share calculators. Math questions on the PSAT can be solved WITHOUT a calculator but students are allowed to use one if they bring their own. We will not be providing students with calculators for the PSAT.

  3. Matrix (matrices) Column 4 Column 1 Column 2 Column 3 Row 1 DEFINITION Row 2 Row 3 Row m

  4. A matrix of m rows and n columns is called a matrix with dimensions m x n. That’s Row x Column And a…

  5. Example: Find the dimensions. 2 X 3 3 X 3 2 X 1 1 X 2

  6. What's your address? x21 7 in X 0 in U u11 -5 in P p12 b34 = –7 e32 = –2 – 5 b42 = g21 = –3 b54 = 3 d21 = Does not exist

  7. Addition and Subtraction of Matrices

  8. To add matrices, we add the corresponding elements. They must have the same dimensions. A + B N + O = No can do! Must have the same dimensions!

  9. When a zero matrix is added to another matrix of the same dimension, that same matrix is obtained.

  10. To subtract matrices, we subtract the corresponding elements. The matrices must have the same dimensions.

  11. PRACTICE PROBLEMS: 2.) T + U – S =

  12. ADDITIVE INVERSE OF A MATRIX:

  13. Scalar Multiplication: We multiply each # inside our matrix by k.

  14. Examples:

  15. Solving a Matrix Equation Solve for x and y: 2y – 1 = – 13 – y x + 8 = 14 – x 3y = – 12 y = – 4 2x = 6 x = 3

  16. Solving a Matrix Equation Solve for x and y: Solution Step 1: Simplify

  17. Scalar Multiplication:

  18. 6x+8=26 6x=18 x=3 10-2y=8 -2y=-2 y=1

  19. Homework • Page 41 #1 – 15 FC • Page 42 #1 – 14 FC FC means (1st column)

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