A parabola has its focus at coordinates (2, 5/2). It has its directrix at y = 7/2. Write the equation of the parabola in Vertex Form.

A. y = −
1
2
(x − 2)
2 + 3

B. y =
1
2
(x − 2)
2 + 3

C. y = −
1
2
(x − 2)
2 + 4

D. y = −
1
4
(x − 2)
2 +
11
4

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)

company a

step-by-step explanation:

using the linear regression models , it is found that company a   pays about $14 more. but using the same regression (linear) company b pays about $10 more.

so company a pays more than b

step-by-step explanation: s