Which of the following sets of elements is arranged in order of decreasing electronegativity? CI, S, Se
F. B. O
Br, CI, S
Be, O. N​

i wish i could but this one is weird give me abc and i can solve it.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.