7. Find a quantity such that by adding it to each of the quantities a, b, c, d, we obtain four quantities in proportion.
8. What values must be given to a and b, so that
may be equal?
7. Find a quantity such that by adding it to each of the quantities a, b, c, d, we obtain four quantities in proportion.
8. What values must be given to a and b, so that
may be equal?