Width times length equals area so 13 times 17 equals 221 and multiply that by the price of each square inch so he should charge $66.30
Then the original price was $42
Because it is half off we multiply 21 by 2 and get 42.
The answer is x=-7
8x-7x-2=-9
8x-7x=-9+2
-7
Since it's a right triangle you can use the Pythagorean theorem or Trig (Soh Cah Toa).
I'll just use the Pythagorean theorem : a² + b² = c²
a = 9
b = x
c = 18
9² + x² = 18²
81 + x² = 324
x² = 324 - 81
x² = 243
x = √(243)
factor 243 to find a perfect square
x = √(3*81)
x = 9√(3)<u />
Answer:its number 3
Step-by-step explanation:
