Anna's hair is 24 inches long. This is 12 inches longer than her
Sister's. Write and solve an addition equation to find the length of her
sister's hair.

s+12=24 & s=12

Step-by-step explanation:

Annas hair is 24 inches and is longer than her sister's hair by 12 inches.

We can come to the conclusion her sister's hair is 12 inches less than Anna.

Sisters hair = s

s=24-12

but, this needs to be an addition equation, so we add 12 to both sides to move the negative 12 over.

s+12=24

after solving, you get

s=12

her sisters hair is 12 inches.

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)