Ineed step by step to do the following math problem. 8.49×10-2. standard form (decimal).

Step-by-step explanation:

8.49 x 10^-2 =

8.49 * 1/(10^2) =

8.49 / 100 =

0.0849

** examples :

x^ - 4 = 1 / (x^4)

5^-3 = 1 / (5^3)

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.