Pls answer these i dont know how it is or whats the answer

9) A. -4x + y + 6z

10) A. 8x² - x - 2

Step-by-step explanation:

9)

(2x + 5y - z) + (-6x - 4y + 7z)

2x + 5y - z - 6x - 4y + 7z

-4x + y + 6z

10)

(3x² - 5x - 6) + (5x² + 4x + 4)

8x² - x - 2

U can use math-way too

whole number data type

step-by-step explanation:

as whole number type represents whole number

like 1, 2 ,3, 4

in other words the whole numbers are those numbers which cannot be written infraction.

since we can take days as a whole number i.e 1 day 2 day and we cannot write 1.2 day hence we will use whole number data type

the answer is -1 for this question

step-by-step explanation: