In 2018, there were about 32 million teenagers (aged 13–17) in the United States. They each sent an average of 1200 text messages per month. About how many text messages did all of the teenagers in the United States send each month? Express your answer using SCIENTIFIC NOTATION.

3.84x10^10

Step-by-step explanation:

32,000,000 teenagers

1200 text messages per month

32,000,000 * 1,200= 38,400,000,000(scientific notation)> 3.84x10^10

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)