217.7026683718 rounded to the nearest thousandth

217.703

Step-by-step explanation:

From the decimal you have tenths, hundredths then thousandths so you need to round to the 3rd decimal place. The 4th decimal place is greater than 5 so you would round the thousandths place up to 3.

217.703

Step-by-step explanation:

The thousandth place is the third digit to the right of the decimal point. Since the number on the ten thousandth place is greater than 5, then the number on the thousandth place (which is 2) is rounded up to 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.