You add the exponents together when multiplying
A rhombus is quadrilateral where all 4 sides are of equal length. Thus
5x + 2 = 2x + 12
3x = 10
x = 10/3
substituting x into either expression, yields
56/3
therefore side AB = 56/3
343 divided by 7 is 49
There are 49 groups of 7 in 343
The answer is 49
If your trying to solve for x it’s 40, x=40
2 times 1/2x =2x20
x=2x20
x=40