F12 2 -ans

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F12 2 -ans

  1. 1. Test 2 Math 123a (Show all work.)1. Calculate 5 – [3 – (4 – (–3))] – (–4 ) 2. Calculate 5 – 2[3 – 5 (-4 )]5 – [3 – (7)] – (–4 ) 5 – 2[23]= 5 + 4 + 4 = 13 = 5 – 46 = -413. Calculate a. –5 2 – (–3)2–25 – 9 = –344. Evaluate a. –2x2 – x + 7 if x = – 3 5. b2 – 4ac if a = – 4, b = –3, c = 2– (–3)2 – (–3 ) + 7 = 1 (–3)2 – 4(–4)(2) =41Combine like-terms: −5 2 16. A. 6 x + x −( − x ) 3 4 7. 3(2x – 3y) – 4(-4y – 2x)Solve the following equations:8. A. 2(x – 5) + 2 = 8 9. 3x + 3( 1 – 2x) – x = 4(x – 3) 2x – 8 = 8 -4x + 3 = 4x – 12 x=8 15 = 8x15/8 = x10. Apple cost $ 2 a pound and pears cost $5 a pound. Let x be the number of lb of apples, y be thenumber of lb of pears,a. what is the total cost in terms of x and y b. How much more does the pear cost (we bought more pears)2x + 5y 5y – 2x11. Many and Joe are to share $240 . Mary gets $ 30 more than twice of what Joe gets. Hon much doeseach person get?Let x =$ that Joe getsthen Mary gets (2x+30)so x + (2x+30) = 240 x =70 Joe gets $70 are May gets $ 170

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