Plz help plz help fast fast

false

false

negative

0

a+b/2

17/54

0

-12/25

2/7(-1/5)+2/7 times 3/8

1

Step-by-step explanation:

if u do KFC or KCF u can see its not equal

if pos divided by pos it equals pos

pos divided by neg is neg

neg divided by neg is pos

zero is the additive identify

a rational number between two rational numbers a and b is a plus b divided by 2

hope this helps

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.