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kykrilka [37]
3 years ago
15

I need help on math:(

Mathematics
1 answer:
Nadusha1986 [10]3 years ago
4 0

Answer:

A. 10

Step-by-step explanation:

The perimeter is the sum of all the outside lengths

Therefore, to find the value of x, you must do:

x + x + 5 + x + 7 = 42

3x + 12 = 42

3x = 30

x =10

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From a train station, one train heads north, and another heads east. Some time later, the northbound train has traveled 12 miles
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Answer:

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__

<em>Additional comment</em>

You may recognize the given distances are in the ratio 3 : 4.  You may recall that side ratios of 3 : 4 : 5 make a right triangle. If so, you recognize that the straight-line distance is (4 miles)×5 = 20 miles. (3:4:5 right triangles show up often in algebra and geometry problems, so might be something you want to look for.)

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