Solve for x.
1/2x = 20

1/40

1/10

10

40

D. 40

Step-by-step explanation:

1/2x=20

1/2x × 2=20 × 2 ⇔ multiplication property of equality

    x=40

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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)