3 years ago

How many sides does the thirtieth figure have?

Mathematics

2 answers:

AlladinOne [14]3 years ago

7 0

Answer:

Step-by-step explanation:

multiples of 3 for every shape.

faltersainse [42]3 years ago

4 0

Answer: 7 sides

step by step:
first 3 have 3 sides (3 shapes)
second set of 3 have 4 sides (6 shapes)
the next set has 5 (9 shapes)
the next set has 6 (12 shapes)
the next set has 7 (the 13th shape would be in this set)

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shtirl [24]

$2x+y=20 \ \ \ |\times 2 \\
4x-2y=40 \\ \\
4x+2y=40 \\
\underline{4x-2y=40} \\
4x+4x=40+40 \\
8x=80 \ \ \ |\div 8 \\
x=10 \\ \\
2x+y=20 \\
2 \times 10+y=20 \\
20+y=20 \ \ \ |-20 \\
y=0 \\ \\
\boxed{(x,y)=(10,0)} \Leftarrow \hbox{answer A}$

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Answer:

Step-by-step explanation:

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