Which of the following shows that polynomials are closed under subtraction when two polynomials, (5x2 2x − 6) − (3x2 − 6x 2), are subtracted? 2x2 − 4x − 4; will be a polynomial 2x2 − 4x − 4; may or may not be a polynomial 2x2 8x − 8; will be a polynomial 2x2 8x − 8; may or may not be a polynomial.

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.