Plz answer both of these, making this worth several points:
a rectangle has length 10 feet and width 6 feet. it is enlarged to a similar rectangle with length 18 feet. what is the new width?

if 200 vitamins cost $4.75, what should 500 vitamins cost?

Length:Width 10:6 18:x Cross multiply; 10x/6x18 108/10x; x=10.8 200=$4.75 500=x Cross multiply 4.75x500/200x x=11.875

Step-by-step explanation:

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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