A. The total cost for Greg's sand pit can be represented by the equation y=5x +200.
B. The total cost for Sadie's sand can be represented by the equation y=50x+12.
C. 20 tons of sand will cost 300 dollars for both sadie's Sand and Greg's sand pit.
D. If the elementary school needs 30 tons of sand, Sadie's sand would cost less.
E. The system has infinite solutions.
Select all that apply.

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