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SashulF [63]
3 years ago
14

Solve 10a-5b=25 for b

Mathematics
1 answer:
devlian [24]3 years ago
6 0
         10a - 5b = 25
10a - 10a - 5b = 25 - 10a
                 -5b = -10a + 25
                  -5            -5
                    b = 2a - 5
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===============================================

Explanations:

To get the perimeter, you add up the three exterior (aka outer) sides. So you add up everything but the length measuring 13 cm, as this segment is not on the outside of the triangle. Imagine this is a parking lot and you want to put fencing around the outer sides. You won't build any fencing to run through the middle of the lot (assuming you don't want to subdivide)

So we add up 15.4, 18 and 25.1 to get 15.4+18+25.1 = 58.5 centimeters. The units stay at centimeters. We don't go to "square centimeters" like we do with the area below.

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