Question

Please help.
Is algebra.
PLEASE HELP NO LINKS OR FILES.
I don't want links.

Answer 1

Answer:

6. -10

7. B

Step-by-step explanation:

6.

Let's start by substituting the blank with a variable. We will be using a for the variable in this case. Thus, our new equation is:

$(-m^5 + 9 + 2m^3) - (a + m^3 - 8m^5) = 7m^5 + m^3 + 19$

Then we solve for a.

$(-m^5 + 9 + 2m^3) - (a + m^3 - 8m^5) = 7m^5 + m^3 + 19\\-m^5 + 9 + 2m^3 - a - m^3 + 8m^5 = 7m^5 + m^3 + 19\\7m^5 + m^3 + 9 - a = 7m^5 + m^3 + 19\\9 - a = 19\\-a = 10\\a = -10$

The missing term is -10.

7.

$(10r^3 - 4r^2) - (2r^4 + 7r^3 + 6r^2) - (10r^4 + 4r^3) =\\10r^3 - 4r^2 - 2r^4 - 7r^3 - 6r^2 - 10r^4 - 4r^3 =\\-12r^4 - r^3 - 10r^2$

B