What multiple of 7 is also a factor of 7?

Based on the diagrams, what is the value of x?

What’s the answer? and how do i solve it ?

In 2014, the three largest economies in the world were (listed in order, from largest): a) the u.s., china, germany. b) the u.s., china, japan. c) china, the u.s., japan. d) china, the u.s., germany.