What is angle between the vectors 2i -3j +K and 3i +2j
?
a. 90°
C. 60°
b. 0°
d. 120°​

What happens to light waves from a star as the star moves away from earth?

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.