True or false the sum of two trinomials is always a trinomial

True.

Step-by-step explanation:

If the two trinomials are given as

x³ + 2x² + 4 = 0

and

2x³ + x² - 3 = 0

Then by adding these trinomials we get

(x³ + 2x² + 4) + (2x³ + x² - 3) = 0

3x³ + 3x² + 1 = 0

Which proves that sum of two trinomials is ALWAYS a trinomial.

So the answer is True.

answer: the price of one pound cabbage = $ 0.8

the point (10,8) represents that the cost of 10 pounds cabbage is $ 8

step-by-step explanation:

since, here is a proportional relation between the number of pounds of cabbage (x) and the price in dollars (y).

therefore, we can write,

⇒ y = k x

where k is the constant of proportionality.

now, point (5,4) is in the line.

thus, it will satisfies the above equation of line.

⇒ 4 = 5 k

⇒ k = 0.8

thus, the equation of the line is,

y = 0.8 x

a) for x = 1,

y = 0.8

therefore, the cost of one pound of cabbage is 0.8 dollars.

b) in the below graph (10,8) represents that the cost of 10 pounds of cabbage is 8 dollars.