What expression represents the length of the rectangle?

9 + x

Step-by-step explanation:

81 - x² ← is a difference of squares which factors in general as

a² - b² = (a - b)(a + b), thus

81 - x²

= 9² - x² = (9 - x)(9 + x)

Area = length × width = 81 - x² = (9 - x)(9 + x)

Since width = 9 - x then length = 9 + x

income. 10x+1300

expenses 3x+(1800+1500)

expenses 3x+3300

to break even:

income = expense,

10x + 1300 = 3x + 3300,

solve for x.

step-by-step explanation:

mark brainliest