Use the echelon method to solve the system of two equations in two unknowns. check your answers. 5x – 3y = 1 8x - y = 13 select the correct choice below and fill in any answer boxes within your choice. o a. the solution of the system is . (simplify your answer. type an ordered pair) ob. there are infinitely many solutions. the solution is ( o c. there is no solution y), where y is any real number

Lorne subtracted 6x3 – 2x + 3 from –3x3 + 5x2 + 4x – 7. use the drop-down menus to identify the steps lorne used to find the difference.

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect

What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.