The movie theatre sells regular admission tickets and 3D admission tickets. Last weekend, they sold twice as many 3D tickets as
regular tickets, earning a total profit of $3040. A regular ticket costs $10
and a 3D ticket costs $15. Which pair of equations represents this situation?
a. x+2y=3040
10x+15y=3040
b. 2x=y
10x+15y=3040
c. x=2y
10x+15y+3040
d. 10x=15y
x+2y=3040

the answer is d. 75%

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)

$12. that is my answer.