The diagram shows the electric field lines around two charges. based on the field lines, what is the best description of the charges ? a.) they are negative, and they repel b.) the left is negative and the right is positive, so they attract. c.) the left is positive and the right is negative, so they attract. d.) they are positive, they repel

The law of charges states that, like charges repel while unlike charges attract.
It is also important field lines move from positive to negative. 

From what we can see in the diagram, the field lines are moving away from the 2 charged particles  p and q. This tells us that the two charges are positively charged. 
Since, the two charges are having the same charge, they repel.

The best description of the charges is,   D.) they are positive, they repel

In finance, diversification is the process of allocating capital in a way that reduces the exposure to any one particular asset or risk. a common path towards diversification is to reduce risk or volatility by investing in a variety of assets.

To compare speeds speeds of wagons we will use second newton's law. it states: f = m * ahere we can see that force depends on the acceleration. if we know acceleration for both wagons we can compare them to make conclusion of speeds of wagons.we have: m1 = 10lbm2 = 20lbf1 = 2*f2also: m2 = 2*m1for bill we have equation: f1 = m1 * a1for tom we have equation: f2 = m2 * a2after inserting identities we have: 2*f2 =m1 * a1f2 = 2*m1 * a2in order to make conclusions about speeds we will solve these equations for a and find their ratio: a1 = 2f2 / m1a2 = f2 / 2m1a1 / a2 = (2f2/m1) / (f2/2m1)a1 / a2 = (2f2*2m1) / (m1*f2)a1 / a2 = (4f2m1) / (m1f2)a1 / a2 = 4this ratio is bigger than 1 and this means that a1 is greater than a2. a1 is 4 times greater than a2. speed of bill's wagon is 4 times greater than speed of tom's wagon.