Hi there!
a. 8x^2 - 1
(x^2 - 4x + 5) + (7x^2 + 4x - 6)
= x^2 + 7x^2 - 4x + 4x - 1
= 8x^2 - 1
b. 5x^2 + 7x - 7
(7x^2 + 4x - 6) - (2x^2 - 3x + 1)
= 7x^2 + 4x - 6 - 2x^2 + 3x - 1
= 7x^2 - 2x^2 + 4x + 3x - 6 - 1
= 5x^2 + 7x -7
Hope this helps!
20,825 because I think you just multiply 245 and 85 and that should be the answer
I would just round up to 200 and then subtract twelve or just subtract 200 what ever way u prefer.
In your question where there is an acres which has a circular irrigator with a center pivot and covers 20 acres in the farm, the ask is how long is the irrigation boom in feet from the center to its farthest extent. The best answer that i could give is 526.6 feet.
