How do i get x? i’m confused on what numbers go where

x = 2√13

Step-by-step explanation:

First, we can put out a lot of equations to see if we can make a system:

x² = y² + 4², x² + z² = 13², xz = 13y, y² + 9² = z²

Substitute 4 into 1: x² = (z² - 9²) + 4²

System 2 and substitution: x² + z² = 169, x² - z² = -65

Elimination: 2x² = 104

Divide: x² = 52

Square root: x = √52 = 2√13

step-by-step explanation:

so first find out how much each is worth.

quarter= 25 cents

dime= 10 cents

pennies= 1 cent

then multiply each by how much each is worth.

200                     150                   300

x                         x                     x   1

  25                       10              

                                  300

1000                     1500

+                          

4000                                      

5000                                  

then count 2 from the back and add a period.

$50.00

$15.00

$3.00

and then add them

  $50.00

+

  $15.00

+

    $3.00

$68.00

so sunghee has $68.00

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