Answer:
Which design do you prefer
Step-by-step explanation:
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What are u trying to ask the number of boys or girls or both?
Answer:
Step-by-step explanation:
No idea what a gouilleul Sequence is, but hopefully it will help to show how I would find the answer.
A geometric sequence means a term is multiplied by something over and over So say we start with 100 and the common ratio is .5 then the sequence would go 100,50,25,12.5,6.25 and so on. Another way of writing it is:
100*.5^0 = 100
100*5^1 = 50
100*.5^2 = 100*.25 = 25
and so on.
ANyway, here we have the first and fourth term. so that's 3.5*x^0 and 3.5*x^3. Keep in mind the exponent will be n-1 when the term you want to find is the nth term. Anyway, we know 3.5*x^3 = 28, so we just use algebra to find x, which is the common ratio.
3.5*x^3 = 28
x^3 = 8
x = 2
So the common ratio is 2, or in other words it keeps doubling. You could try it real quick, keep doubling the starting term 3.5
3.5, 7, 14, 28 and 28 is the fourth term.
So we know the common ratio. you could just add the four terms listed then for part b, but there is an equation, for in case they ask you to find the sum of say the first 100 terms. that wouldn't be fun. Anyway, the formula is a((1-r^n)/(1-r)) where a is the starting term, r is the common ratio and n is the number term. In your case that's 3.5((1-2^4)/(1-2)) = 52.5. You can actually check since it's only 4 terms. 3.5 + 7 + 14 + 28 = 52.5.
If you want to know how that formula was gotten let em know and I can explain or give a link to a video or something to show.
Answer:
r = 9.61 cm
Step-by-step explanation:
Volume of a rectangular box = length × width × height
= 21.5 cm × 13.5 cm × 6 cm
= 1,741.5 cm³
Volume of a rectangular box = 1,741.5 cm³
Since,
Volume of a rectangular box = Volume of a circular box
Then,
1,741.5 cm³ = Volume of a circular box
Volume of a circular box = πr²h
1,741.5 cm³ = 3.14 * r² * 6 cm
1,741.5 = 18.84r²
r² = 1,741.5/18.84
r² = 92.436305732484
r = √92.436305732484
r = 9.6143801533163
Approximately,
r = 9.61 cm
