On 3/20/2021 in Japan there was a earthquake 7.0 and 34 miles deep is the magnitude measured at 35 miles down or at the surface?

substitute these simultaneous equations

a + 2p = 4

x − 2y = 6

Explanation:

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.

the answer is the last option or letter d)