The pressure on earths crust in region a is three times greater than the pressure on earths crust in regiom b. the pressure in region b is 10 mpa. write and solve an algebraic equation to calculate the pressure in region a.

A=3B

Therefore A=30 mpa

are you referring to matrix mathematics!

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.