Which equation describes a circle with center (4, -7) and radius 9? A

B

(x-4)² + (y + 7)² = 9

(x + 4)² + (y-7)² = 81

(x+4)² + (y-7)² = 9

(x-4)² + (y + 7)² = 81

seems like d

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)

pls ask

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11 -1> 1 -1+ a

-12 > a