Which polynomial is in standard form? a) 2x3 + 3x6 − 6x8 + 7x9 + 9 b) 2x + 9x2 + 7x3 − 3x4 + 3x5 c) 3 + x3 − 5x2 + 7x4 + 9x3 d) 5x7 + 7x5 − 6x3 + 3x2 − x

D)5x7 + 7x5 − 6x3 + 3x2 − x

Step-by-step explanation:

yes

yes yes yes

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)