Using Euler's formula, how many faces does a polyhedron with
20 vertices and 30 edges have?
[?] faces

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.