Stella is using grid paper to make shapes. Her first shape has an area of 14 square units. Her second shape has an area of 28 sq
uare units. Her third shape has an area of 42 square units. If this pattern continues what will be the area of her fourth shape
1 answer:
Answer:
56
Step-by-step explanation:
The pattern is an arithmetic sequence:
by the first three terms, the common difference is:
28-14=42-28=14
So the next pattern would be:
14+42=56
By the equation x = a + d ( n - 1 )
Substituting when n=1, x=14 and when n=2 x=28
a = 14 and d = 14
x = 14 + 14 ( n - 1 )
substituting n = 4
x = 14 + 14 ( 4 - 1 )
x = 56
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