Evaluate the expression when a=5 and b= -5. -a +8b

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?

What is the circumference of a circle with an area of 50.24 cm²?