Tickets to a concert cost $10 in advance and $15 at the door. if 120 tickets were sold for a total of $1390, how many of the tickets were purchased in advance?

Step-by-step explanation:

10a + 15d = 1390

a + d = 120d = 120 - a

10a + 15(120 - a) = 1390

10a + 1800 - 15a = 1390

-5a + 1800 = 1390

-5a = 1390 - 1800

-5a = - 410

a = -410 / -5

a = 82 < advance tickets

a + d = 120

82 + d = 120

d = 120 - 82

d = 38door tickets

according to this law, when unemployment goes up by 1%, gdp drops by 2%. in the question, unemployment rate goes from 2% to 5%, meaning unemployment goes up by 3%, so the gdp drops by 6%. thus the effect is a drop in gdp by 6%.

step-by-step explanation: