In a school experiment the temperature of a substance is changed from 42 degrees F to - 54 degrees F at an average rate of 12 degrees per hour. Over how many hours does the change take place?

What the perimeter of 2m 10cm and 45cm of a rectangle

The cost of tuition at Johnson Community College is $200 per credit hour. Each student also has to pay $70 in fees

What fraction is half way between 3/5 and 5/7?

What is 5 over 4 equal - 4 plus 1 over 4

I don't know what - 9/32 is

What is the equation of slope=-8/5, y intercept = 4

Select the correct answer. Anna learns in her science class that the human eye blinks an average of 4,200,000 times a year. What is this number expressed in scientific notation? A. 4.2E6 B. 4.2E-6 C. 42E6 D. 4.2E5 E. 4.2E-5

Kip is going to meet his family. Predict the number of kilometers that will remain after 7 hours. The table shows the number of kilometers he needs to travel until he reaches them. Enter the correct answer.

What is the main reason the US civil war was started

How do you show 2+3i is a root of x^2-4x+13