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A whole number is a
a. Determine which of the following numbers are perfect.
i.
b. Find at least one more number that is perfect.
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Chapter 4 Solutions
A Problem Solving Approach to Mathematics for Elementary School Teachers, Books a la Carte Edition plus NEW MyLab Math with Pearson eText - Access Card Package (12th Edition)
- Consider the problem of minimising the Euclidean distance from the point (-4,5) in the plane to the set of points (x, y) that have integer coordinates and satisfy the inequality: x2 y² + ≤1. 4 9 (a) Use an exhaustive search to solve this problem. (b) Use a local search method to solve this problem. First, define the search space and the neighbourhood. Then, attempt to find the minimum starting from the initial point (x, y) = (2,0). The neighbourhood of a point should contain at least two distinct points but must not encompass the entire feasible search space. Will your local search method find the global optimum?arrow_forwardConsider the relation ✓ on R² defined by u ≤ v u₁ + v₂+ 3u1 v² < u₂ + v³ + 3u²v₁ (u³ + v2 + 3u1v = u₂+ v³ + 3u²v₁ and u₂ < v2) u = v for any u, vЄR² with u = = (u1, u2), v = = (V1, V2). or 우우 or 1. Prove that the relation ✓ is translation invariant. Hint: Use the formula of (a + b)³ for a, b = R. 2. Is the relation ✓ scale invariant? Justify your answer. 3. Is the relation ✓ reflexive? Justify your answer. 4. Is the relation ✓ transitive? Justify your answer. 5. Is the relation ✓ antisymmetric? Justify your answer. 6. Is the relation ✓ total? Justify your answer. 7. Is the relation ✓ continuous at zero? Justify your answer.arrow_forwardLet X = [−1, 1] C R and consider the functions ₤1, f2 : X → R to be minimised, where f₁(x) = x + x² and f2(x) = x-x² for all x Є X. Solve the tradeoff model minøx µƒ₁(x)+ƒ2(x), for all values of µ ≥ 0. Show your working.arrow_forward
- 7 3 2 x+11x+24 9 2 5 x+11x+24arrow_forwardConsider the following linear programming problem: min x1 x2 3x3 − x4 s.t. — 2x1 − x2 − x4 ≤ −6 x1 x2 x3 + 2x4 <4 x1, x2, x3, x4 ≥ 0. (i) Write an equivalent formulation of this problem, to which the primal-dual algorithm can be applied. (ii) Write out the dual problem to the problem, which you formulated in (i). (iii) Solve the problem, which you formulated in (i), by the primal-dual algorithm using the dual feasible solution π = (0, -3). Write a full record of each iteration.arrow_forward2 4 + 4x 2x 8 || 12arrow_forward
- ୮ dx L1+zadz 1+x2arrow_forwardConsider the following Boolean Satisfiability problem: X2 F (X1, X2, X3, X4, x5) = (x1 √ √ ¤;) ^ (ס \/ ˜2\/×3)^(×k \/×4 \/ ×5) ^^\ (×1\/15), Є where i Є {2, 3, 4, 5}, j = {1, 4, 5}, k = {1, 2, 3} and l € {1, 2, 3, 4}. xk Can this problem be solved by using the Divide and Conquer method?arrow_forwardYou assume that the annual incomes for certain workers are normal with a mean of $28,500 and a standard deviation of $2,400. What’s the chance that a randomly selected employee makes more than $30,000?What’s the chance that 36 randomly selected employees make more than $30,000, on average?arrow_forward
- What’s the chance that a fair coin comes up heads more than 60 times when you toss it 100 times?arrow_forwardSuppose that you have a normal population of quiz scores with mean 40 and standard deviation 10. Select a random sample of 40. What’s the chance that the mean of the quiz scores won’t exceed 45?Select one individual from the population. What’s the chance that his/her quiz score won’t exceed 45?arrow_forwardSuppose that you take a sample of 100 from a population that contains 45 percent Democrats. What sample size condition do you need to check here (if any)?What’s the standard error of ^P?Compare the standard errors of ^p n=100 for ,n=1000 , n=10,000, and comment.arrow_forward
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