4. How many solutions does the equation x1 + x2 + x3 + x4 = 18 have, such that x1, x2 and x3 are positive integers and x4 = 3? (a) (¹7) (b) (²) - (¹₂7) (c) 15! (d) (¹4)

4(z+12)+13=29. find z

2. Select all expressions that are equivalent to x-4-32 A (x-16*x+2x 8.(x+2*x-16) -CH-S*X+4) D.(x+8xx-4) E (x+4*x-8) Etx-4*x+8) 3. Select all solutions to the equation (2x - 4x + 5) = 0 A1=-= 8x== Cx=22 0.x = 2 b) Sections with are optional Ex = -5 F.x=3 4. Show that (3x - 1Xxx + 5) is equivalent to 3x² + 14x-5 height (feet) E60302 SU 10 5. The height of a sortbail in feet, is modeled by the function is given by h(ty = 3+55:- 16r, where is the time, in seconds, after the softball is hit. A graph of the function is shown. time (seconds) a. About when does the softball reach its maximum height? b. About how high is the maximum height of the softball? 6 Here is a graph that represents a quadratic function which equation could de this function? About when does the ball hit the ground? Ax=(x-2*x + 3) 8.y=(x-2x-3) V x=(x+26x31 D. x = (x + 2x-3) 7. Salve the equation 2x - 7x-15 = 0 Explain or show your work 8. Complete the long division problem to find the quotient of 1,651 and 13 1 13

If A₁ = a a₁ b₁c₁ d₁ e₁ [a₂ b₂ C₂ d₂ e2 f2. real numbers, show that: 9. (A₁ #A₂) + A3 = A₁ + (A₂ + A3) 10. (k+h) A₁ = kA₁ +hA₁ A₂ = 3. and A3 = [a3 b3 C3] [d3 e3 f3] 11. k (A₁ + A₂) = kA₁+kA₂ 12. k (hA3) = (kh) Az are any 2 x 3 matrices, and k and h are

han y=4x – 11 2x + 3y =9 2x 3(4x - |1 )=9 2x+12-33

Which of the following is equivalent to Ⓒ² (25. (A) B) C (D - 4x + 6) dx √₁² (2³ − 42³ + 6) dr - [² 1.² 20² (x5 - 4x + 6x-2) dx √₁² (2²-42³ +62-²) da x74x³ +6 x² dx?

Prove they are equal 4 = 7(2x+ 1) - 5x -3(3x + 1)

Find the term of (x² +x-3)"0 that has x185 in it.