Melissa sells necklaces for $8 each and bracelets for $3 each at the spring carnival. She sells n necklaces and (n+4) bracelets. The expression 8n + 3(n + 4) represents Melissa’s total sales. Select the equivalent expression for Melissa’s total sales at the carnival. a.9n + 7

b.9n + 12

c.11n + 12

d.11n + 7

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?