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The trick to solving this problem is realizing that you need to break it up into parts.  Find the number of totals with one, two, three, or four bills, then add them up.  Since this is a combination problem, you can find each of the numbers with the combination formula, but the numbers...

10.5 is equal to the fraction 21/2, so you can multiply 1.79 by two and divide by 21.

d+ 2d - 8 = 0 (answer)

As has been noted above, the problem can be solved both factoring and the quadratic formula.  If you can't factor or remember the formula, you can also solve it using a process called completing the square. First, divide the equation through by a, and subtract c from both sides...

The absolute value of x is x if x is positive and -x if x is negative.  For example, |5|=5 and |-4|=4. I'm going to assume that for your problem you meant 10=|4x-6|.  What you need to do is try the problem assuming that 4x-6 is positive and that 4x-6 is negative.  Then you need...

The answer is y=3x+1. There are several ways to find the answer to this question, and a few different formats in which to put the answer.  I prefer slope-intercept form, so I will explain it by that method. y=mx+b m=slope b=y-intercept The y-intercept is the value...

The formula for the length of a line segment is naturally the same as the formula for the distance between two points, or sqrt((x1-x0)^2+(y1-y0)^2).  In this instance: sqrt((0-0)^2+(12-3)^2))=sqrt(0+81)=9 As a way of understanding the solution, you may want to graph the...

A cube has 8 vertices (corners, points), 12 edges (line segments), and 6 faces (planes).  One formula that works for any solid with flat sides and no holes is vertices+faces-edges=2.

Two functions are inverses if the composition of the functions equals x.  In other words, f and g are inverse functions if fog(x)=gof(x)=x. f(g(x))=(7/2)(2x+8)/7-4=x+4-4=x g(f(x))=(2((7/2)x-4)+8)/7=(7x-8+8)/7=x So, f and g are inverses.

The first step is always to assign letters to the variables.  We can call length L and width W. Since all units are in cm, unit conversion is unnecessary. Next, set up some equations.  L=2W-6 because of the first sentence of the problem.  Length times width equals area,...