A polyhedron has 6 faces and 7 vertices, how many edges does it have

Step-by-step explanation:

Euler's Formula:

We have:

Substitute these numbers into formula and solve for E:

This polyhedron  has 11 edges

do you mean add both of the equations together

because if you do the answer is 10x-5

step-by-step explanation:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)