Yesterday, there were 30 problems assigned for math homework

Nancy did 10% of them incorrectly.

How many problems did Nancy get wrong?

3

Step-by-step explanation:

10 % = .1

30 x .1 = 30.0 -> 3.00

move decimal one place to the left!

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)

-1/4 > -1 2/3. -1/4 is greater than -1 2/3 because it is closer to 0 on the number line.