Erica purchased adult and youth tickets for a movie. she bought x adult tickets for $7 each and y youth tickets for $5. write an expression that can be used to show the total cost, c, of all tickets.
a. c = 7x + 5y
b. c = (7 + 5)x
c. c = (7 + 5)(x + y)
d. c = 7y + 5x

At dinner, 2/5 of the people had fish and 1/3 had chicken. if everyone else had lamb, what fraction of the people had lamb? and if 40 people had lamb , calculate the total number of people at the dinner.

The following graph shows the consumer price index (cpi) for a fictional country from 1970 to 1980? a.) 1976 - 1978b.) 1972 - 1974c.) 1974 - 1976d.) 1978 - 1980

Suppose sat writing scores are normally distributed with a mean of 497 and a standard deviation of 109. a university plans to award scholarships to students whose scores are in the top 2%. what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.