3. Which statement concerning an ecosystem is correct? A) It can exist with or without a constant source of
energy input.
B) It must contain consumers but can exist without
producers.
C) It involves interactions between biotic and
abiotic factors.
D) It can exist on land, but it cannot exist in lakes,
rivers, or oceans.

C) It involves interactions between biotic and

abiotic factors.

Explanation:

Ecosystems need energy imput, need both consumers and producers, and can exist on land, lakes, rivers and oceans.

x² - 3x - 10

x² = x * x

10 can be factored:

1 x 10 ⇒⇒⇒ difference between factors = 9

2 x 5   ⇒⇒⇒ difference between factors = 3  ⇒ (The correct pair)

(x-5)(x+2) = x(x+2) - 5(x+2)

                = x² + 2x - 5x - 10

                = x² - 3x - 10

∴ x - 5 = 0  ⇒⇒⇒ x = 5

  x + 2 = 0  ⇒⇒⇒ x = -2

I have attached algebra tiles for the given equation.

bye

Step-by-step explanation: