Nina got a 86% on her science quiz. She got 43 questions correct. How
many questions were on the test? (What do you know, the part or the
whole?) *

50 questions

Step-by-step explanation:

I solve these by setting up the ratio as two fractions.

You already know she scored 86/100, and are trying to find the number of total questions, which will be x. The second part is represented as 43/x.

Then, you solve for x. You could go through the entire process, but the shortcut I've been taught is to multiple the diagonal values, and divide by the corner, which is still the same thing condensed into 1 (technically 2) steps.

(43 x 100) / 86

= 4300 / 86

= 50

I hope this helped!

(You can check the answer by doing 43 / 50 and seeing if it matches up to 86%)

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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answers

rauschg

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step-by-step explanation: