You need to arrange four of your favorite books along a small shelf. How many different ways can you arrange the books assuming the order of the books make a difference

What is the elapse time for start time. 3:48 pm to end time : 8:11 pm?

Ratio of the number of students in art class to the number of students in gym class was 2:7, however art class is small, and gym class is large, students changed for the second semester.

Expand and simplify 2 (3x-5) + 3 (2x+3)

How the area of the sail is related to the weight limit of a pilot

Seth has 23 u. s stamps and 14 foreign stamps he has 27 u. s coins ans 11 foreign coins what fraction of seths collection is from the u. s write the fraction in simplest form

Martha changed 350 US dollars into 385 Australian dollars. How many Australian dollars did she receive for each US dollar?

The temperature at 9am was 13.6 deg. Celsius. The temperature at 9pm was 6.4 deg. Celsius. What was the average drop in temperature from 9am to 9pm

In the diagram, a building casts a 21-ft shadow and a flagpole casts a 6-ft shadow. If the flagpole is 15 ft tall, how high is the building?

jacinta says that the product of a positive and negative rational number is always irrational. explain her error.

Denny lives in Maryland and pay 6% in sales tax. He just bought $145 in groceries, but $70 worth of those groceries were non taxable. What is the total amount that Denny paid for the groceries, including the sales tax?