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high school mathematics 5+3 pts

which of the following situations could be represented with the given system of equations? 0.1x+0.6y=0.4(5) x+y=5 a. eunice needs to combine solutions of 0.1m hcl and 0.4m hcl to produce 5l of 0.6m hydrochloric acid (hcl). b. eunice needs to combine solutions of 0.1m hcl and 0.6m hcl to produce 5l of 0.4m hydrochloric acid (hcl). c. eunice needs to combine solutions of 0.4m hcl and 0.6m hcl to produce 5l of 0.1m hydrochloric acid (hcl). d. eunice needs to combine solutions of 0.1m hcl and 0.6m hcl to produce 4l of 0.5m hydrochloric acid (hcl).

Consider the following geometry problems in 3-space enter t or f depending on whether the statement is true or false. (you must enter t or f -- true and false will not work.) f equation editorequation editor 1. a plane and a line either intersect or are parallel t equation editorequation editor 2. two planes parallel to a third plane are parallel f equation editorequation editor 3. two lines either intersect or are parallel f equation editorequation editor 4. two planes orthogonal to a third plane are parallel f equation editorequation editor 5. two planes orthogonal to a line are parallel f equation editorequation editor 6. two planes either intersect or are parallel f equation editorequation editor 7. two lines orthogonal to a third line are parallel t equation editorequation editor 8. two lines parallel to a third line are parallel t equation editorequation editor 9. two planes parallel to a line are parallel f equation editorequation editor 10. two lines parallel to a plane are parallel f equation editorequation editor 11. two lines orthogonal to a plane are parallel