How do you solve for b?
a=1/2h (b+c)

There are different ways to do it.
Here's one:
                                                      A          = 1/2 h (b + c)

Multiply each side y  2 :            2A          =        h (b + c)

Divide each side by  h :           2A/h        =            b + c

Subtract 'c' from each side:     2A/h - c  =            b

The charge of an ion with 55 protons and 52 electrons is +3. the reason is because protons are positive, and there are three more than the amount of negative electrons.

Ireally don’t know