What is the coefficient of x²- 36=0 Wich one?

A. a=1,b=0,c=7
B. a=0,b=0.c=36
C. a=1,b=0,C=-36
D. a=1,b=0,c=36
E. a=1,b=1,c=36​

(C)

Step-by-step explanation:

this is a quadratic equation. the form is

therefore, a=1, b=0, c=-36

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.

$119.20

step-by-step explanation:

$372.50 - 60% off is $149. $149-20% off is $119.20