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Dmitriy789 [7]
3 years ago
7

Somebody help. I can’t figure this question out. thanks

Mathematics
2 answers:
Masteriza [31]3 years ago
6 0

21 \div 30 = 14 \div 14 + x
30 \times 14 = 420
21 \times 14 + x = 294 + 21x
420 = 294 + 21x
420 - 294 = 126
126 = 21x
126 \div 21 = 6
x = 6

vodomira [7]3 years ago
4 0
The large triangle and the smaller one are similar. Comparing long sides to short ones, we get
.. (30 mm)/(21 mm) = (14 mm +x)/(14 mm)
.. (14 mm)*10/7 = 14 mm +x
.. (14 mm)*(10/7 -1) = x
.. (14 mm)*(3/7) = x = 6 mm

The value of x is 6 mm.
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