Agroup of students is arranging squares into layers to create a project. the first layer has 5 squares. the second layer has 10 squares. which formula represents arithmetic explicit formula to determine the number of squares in each layer?
a. a1 = 5; an = 5 ⋅ an − 1, n > 0
b. a1 = 5; an = 5 ⋅ an + 1, n > 0
c. a1 = 5; an = 5 + an − 1, n > 0
d. a1 = 5; an = 5 + an + 1, n > 0

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Write the expression 7x^3-28xy^2 as the product of 3 factors

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