What is the circumference of a circle with a radius of 80 inches? (use pi = 3.14)

The  circumference  of given circle = 502.4 inches

Step-by-step explanation:

Formula:

Circumference of circle = 2πr

Where r - Radius of circle

and π is a constant value

To find the Circumference of circle

Here

radius r = 80 inches and

π = 3.14

Circumference = 2πr = 2 * 3.14 * 80 = 502.4 inches

Therefore Circumference  of given circle = 502.4 inches

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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