The U. S. president gives a speech to a group of students about the importance of schools. The speech comes less than a week after a study found that U. S. students performed lower than students in other countries. Which statement best describes the context of the president's speech? A. The country is concerned the president isn't an effective leader.

B. The country is concerned that students aren't able to pay for college.

C. The country is concerned about students' performance in school.

D. The country is concerned about bullying in American schools.​

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..

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