Find the arithmetic mean an of an-1=3.9 and an+1=7.1

What is 81 to the power of - 1/4?

A rectangular pyramid fits exactly on top of a rectangular prism. The prism has length 15 cm, width 5 cm, and height 7 cm, and the pyramid has height 13 cm. Find the volume of the composite space figure. A) 1500 cm3 B) 500 cm3 C) 2275 cm3 D) 850 cm3

16.5:10 = 1.65 Explain how you decided where to place the decimal

On a map, 1 centimeter corresponds to 2.5 kilometers. What is the length of road that is 7 centimeters long on the map?

An international phone call costs $6.53 for 48 minutes. How many cents per minute

Square root of x^13 simplify

If the perimeter of an equilateral triangle is 30 ft, what is the area? 25√2 sq. ft. 25√3 sq. ft. 50√3 sq. ft.

A car dealer paid a certain a price for a car and marked it up by 7/5 of the price. Later, he sold it for$24.000. What is the original price.

How do u write y=x-4 in standard form using integers. I need the work!

Two number cubes are rolled at the same time. What is the probability that both number cubes will show an even number?