all of the above hoped i helped
Answer: 56 seconds or less
Step-by-step explanation:
3(46 + 52 + 54) 
400 - x
Combine
3(152) 400 - x
Simplify
456 400 - x
Subtract 456 from both sides
0 -56 - x
Add x to both sides
x 56 seconds
Wait... why the nearest tenth? maybe i’m reading the questions wrong but the equation y=-3 is just a horizontal line going through -3 on the y axis, so the diff is just 4
Answer:
The number of people that received copies of the letter at the twentieth stage is<em> 9.537 × 10¹³ </em>.
Step-by-step explanation:
Using the discrete model,
a_k = r a_(k-1) for all integers k ≥ 1 and a₀ = a
then,
aₙ = a rⁿ for all integers n ≥ 0
Let a_k be equal to the number of people who receive a copy of the chain letter at a stage k.
Initially, one person has the chain letter (which the person will send to five other people at stage 1). Thus,
a = a₀ = 1
The people who received he chain letter at stage (k - 1), will send a letter to five people at stage k and thus per person at stage (k - 1), five people will receive the letter. Therefore,
a_k = 5 a_(k - 1)
Thus,
aₙ = a rⁿ = 1 · 5ⁿ = 5ⁿ
The number of people that received copies of the letter at the twentieth stage is
<em>a₂₀ = (5)²⁰ = 9.537 × 10¹³ copies</em>
