1. A circle has a diameter of 7.6 feet. Which measurement is closest to the circumference of this circle? Use 3.14 to approximate π.

a. 23.9 ft
b. 45.3 ft
c. 47.7 ft
d. 11.9 ft

a. 23.9 ft

Step-by-step explanation:

The circunference of a circle is given by the following formula:

In which r is the radius.

A circle has a diameter of 7.6 feet.

The radius is half the diameter. So

The circunference is

So the correct answer is:

a. 23.9 ft

4sqrt5

step-by-step explanation:

the base has dimensions of 8 x 4, so the diagonal is 64 + 16 square rooted or 4sqrt5.

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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