Asmoke jumper jumps from a plane that is 1700 ft above the ground. the function y = -16t2 + 1700 gives the jumper's height y in feet at t seconds. a. how long is the jumper in free fall if the parachute opens at 1000 ft? b. how long is the jumper in free fall if the parachute opens at 940 ft?

(A) 6.6 sec (B) 6.89 sec

Step-by-step explanation:

    y    = -16t² + 1700

 1000 = -16t² + 1700

 -1700             -1700  

  -700 = -16t²

  ÷-16     ÷-16

 43.75 = t²

√43.75 = √t²

   6.6 = t

    y    = -16t² + 1700

  940 = -16t² + 1700

 -1700             -1700  

  -760 = -16t²

  ÷-16     ÷-16

  47.5 = t²

√47.5 = √t²

  6.89 = t

true

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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