Can someone please answer this question please I need it today please answer it correctly and please show work please answer numbers 7and22

7)  B

22) B

Step-by-step explanation:

7)    -4n

The expression must have a negative value

Use three types of examples for n

-4(-1)        -4(0)          -4(1)

 4               0              -4  

Only one of these examples results in a negative number, 1.

1 > 0

Substitute n back into the inequality

n > 0              B

22)   Use two numbers greater than 0 to represent m and n

ex.) m = 1    n = 2

= = -0.5

-0.5 is a rational, negative number.   B

Hope this helps :)

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

0

step-by-step explanation:

you can not divide by 0 so 4 ÷ 0 would be 0

0 × 9999 =0

mark brainliest   : )