III NEEDDD HEELLL WILLL MARK BRAINLIES PLLLEEAASSEE HEE Select the expressions (more than one) that are polynomials.
options:

−2x^3+2x+4

x^2/7+1

x^−3+4x

6x−x^3+4x^2

ok just calm down

Step-by-step explanation:

wait ill let you know in the comments

Polynomials cannot have division or a negative integer exponent.  

−2x^3+2x+4  is a polynomial

x^2/7+1 is not a polynomial (division operation)

x^−3+4x is not a polynomial (negative exponent)

6x−x^3+4x^2 is a polynomial

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)