The expression a[b+(c−d)] is equivalent to:

A. ab+ac−ad

B. ab+ac+ad

C. ab+ac−d

D. ab+c+d

E. ab+c−d

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

Two consecutive negative integers have a product of 30. what are the integers?