Diagonal cross section of a cylinder
1 answer:
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Answer:
Step-by-step explanation:
the ratio of sides of a 30-60-90° triangle, respectively, are 1 : : 2
we can solve for 'x' using this proportion:
x/4 = 1/
now cross-multiply:
x = 4
x = 4/
we don't want to leave a radical in the denominator so we can multiply numerator and denominator by to get:
4 / 3 or
Answer:
Lower limit of the sum: 0
Upper limit of the sum: 17
Explicit formula: ∑(3+7i)
Step-by-step explanation:
Noting that each row has 7 more beads than the previous one and that the series also begins with 3, the formula is:
∑(3+7i)
The lower limit is 0, since 3+ (7 * 0) = 3
When i = 0 you get the value of beads from the first row, when i = 1 you get the value of beads from the second row and so on. Given this, the upper limit is 17.