9. As a speed skater, Kyle cycles between
sprinting and recovering on the
111.12-meter short track during practice
every day for 50 minutes. Let t be the time
in hours that Kyle sprints during a practice.
A. Write the unsimplified expression to
represent the total distance Kyle
skates. It may help you to make a
verbal model to represent the total
distance Kyle skates. Be sure to use
compatible units.
B. Interpret the parts of the expression.
C. Simplify the algebraic expression.
D. If Kyle spent 40 minutes sprinting yesterday, how far did he skate in all?

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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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rauschg

rauschg · hand

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1.30

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