Work out the length X

12.1244 or

Step-by-step explanation:

Use the Pythagorean Theorem and solve for b^2:

7^2+b^2= 14^2

Simplify:

49+b^2= 196

Subtract 49 from both sides:

49-49+b^2= 196-49

Simplifly:

b^2= 147

Unsquare both sides:

y-1700=200(x+4)

step-by-step explanation:

200(x+4) is 200x + 800 she is saving 200 per week x is the weeks and the -1700 is. us that’s howmuch she already had