100 times my
number is 12.6 more
than 5,000

50.126

Step-by-step explanation:

100x=5000+12.6 (believe this is an ok equation) add 12.6 to 5000

100x=5012.6 divide by 100

x=50.126

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

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.