15=-2(2t-1) -- expand brackets
15=-4t+2 -- subtract 2
13=-4t -- switch signs, best to have a positive variable
4t=-13
t=-13/4
C. The Tetrahhedron has 4 faces, all of which are triangles. It also has four vertices and six edges.
Answer 60.375
Explanation
All you do is multiply 7.5 by 8.05 which gets you 60.375
The ratio would be 8:24 (Shoes sold is 8)
If you can find an explicit formula for a sequence, you will be able to quickly and easily find any term in the sequence simply by replacing n with the number of the term you seek. An explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location).
