1) Add the following and write your answer using significant figures. What is 15,000 + 328? 2) Add the following and write your answer using significant figures. What is 51.028 + 3.5?
3) Multiply the following and write your answer using significant figures. What is 25 x 15?
4) Divide the following and write your answer using significant figures. What is 7.921/8.22?

1) 15,328

2) 54.528

3) 375

4)0.96362530413

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m