6−2(4+5)+6what are the steps to getting the amswer -6

6-2(4+5)+6

First, you go off of PEMDAS, (parentheses, exponients, mutiply, divide, add, subract), and you will mutiply -2 to the numbers in the parentheses, -2x4 and -2x5. Which will then give you -8 and -10.

Then you set up your equation as normal, except without parentheses, which will make the equation 6-8+-10+6.

Then you will combine the two negative numbers, and it'll give you -18.

Then you will combine both the positive numbers, and that'll give you 12.

Add 12 to -18 and that will give you -6.

A. They have shorter wavelength then ultraviolet waves. is correct