Solve for k. is there one solution or many?
4 - 2k = -5( k + 7)
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First, you should use the distributive property of multiplication to simplify the right side of the equation.  If you did this correctly, your equation should be 
4-2k= -5k-35.  You are trying to get the variable alone on one side of the equation.  So, you should add 5k to both sides.  If you did this correctly, your equation should be
4+3k= -35.  You need to keep the 3k alone on the left side of the equation, so you should subtract 4 from both sides.  If you did this correctly, your equation should be 
3k= -39.  The coefficient for k (which is 3) is currently being multiplied.  To undo multiplication, we have to divide, so you should divide both sides by 3.  If you did this correctly, then you should have your answer, k= -13.

Your final answer is k= -13.

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.