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Answers by Mary Ann F.

There's a lot of information in this problem, but all these kind of problems are some version of Distance = Rate * Time   If the two riders are going to meet in the middle somewhere, we know that their combined distance covered is 12 miles. Since he left first, let's call Sam rider...

From The description in this problem, we can generate two equations: 3J + 2T = 30   T = 5J - 11   If you substitute the second one (for T) in for T in the first one, you can solve for J. Then replace the solution into either of the original equations and solve for...

Can you picture these two rods as two of the sides of a right triangle? The third side would be formed by connecting the two ends that are not at the origin. This question is asking where (the ordered pair) the centroid of that triangle would be. Since the Centroid is formed at the concurrence of...

14,780,000 -7,300,000  7,480,000  <<< growth in the 23 years from 1190 to 2013 (this is where they get the                             "approximately double in 23 years"   The...

Word problem (answer)

It has already risen 4, so it has 8 inches to go. at 2 inches per hour this will take another 4 hours. In a number sentence we would say it like this:   4 inches + 2 in/hr * (? Hrs.) = 12    Subtract 4 from both sides:   (2 in/hr) * H = 8   H...

Hi Marie - The process of completing the square is pretty simple: Start by moving the constant term to the other side of the equals sign by adding 3 to both sides. Then we have this:   x2 + 2x + ___  = 3    Now divide the coefficient on the x term...

Time "lapse" is the same as "time difference", right? When we use the word difference in math we need to subtract:     9:29 - 6:32       since the minutes in the bottom number are bigger than the ones in the upper number we...

Do you mean, what is the time difference between these the two times given?  The easiest way for me to think about this is to first add whole hours and then work backwards:    1:23 + 3 hours would be 4:23 elapsed time. But that overshoots our target time by the difference...