Marie earned $0.75 for every mile she walked in a charity walkathon. If she earned a total of $18.00 at that rate, how many miles did she walk?

Which of the following represents the total dollar amount that a customer would have to pay for an item that costs s dollars plus a sales tax of 8 percent, in terms of s ?

For each integer n > 1, let A(n) denote the sum of the integers from 1 to n. For example, What is the value of A(200) ?

Which of the following integers CANNOT be expressed as the sum of two prime numbers?

When the positive integer n is divided by 45, the remainder is 18. Which of the following must be a divisor of n ?

Which of the following operations carried out on both the numerator and the denominator of a fraction will always produce an equivalent fraction?

Indicate all such operations

In a certain medical group, Dr. Schwartz schedules appointments to begin30 minutes apart, Dr. Ramirez schedules appointments to begin 25 minutes apart, and Dr. Wu schedules appointments to begin 50 minutes apart. All three doctors schedule their !rst appointments to begin at 8:00 in the morning, which are followed by their successive appointments throughout the day without breaks. Other than at 8:00 in the morning, at what time before 1:30 in the afternoon do all three doctors schedule their appointments to begin at the same time?

Indicate all such times.