Evaluate the expression 3a - 2ab if a= 4 and b= 6 please explain, thank you !
2 answers:
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Answer:
see explanation
Step-by-step explanation:
(a)
A recursive formula allows any term in the sequence to be found by adding the common difference d to the previous term.
Here d = - 4 , then recursive formula is
=
- 4 with a₁ = 2
(b)
The explicit formula for an arithmetic sequence is
= a₁ + (n - 1)d
where a₁ is the first term and d the common difference
Here a₁ = 2 and d = - 4, thus
= 2 - 4(n - 1) = 2 - 4n + 4 = 6 - 4n ← explicit formula
(c)
Using the recursive formula
a₁ = 2
a₂ = 2 - 4 = - 2
a₃ = - 2 - 4 = - 6
Using the explicit formula
a₅ = 6 - 4(5) = 6 - 20 = - 14
a₁₀ = 6 - 4(10) = 6 - 40 = - 34
a₁₀₀ = 6 - 4(100) = 6 - 400 = - 394
For this case we have the following equation:
Where,
d: the distance they can see in thousands
h: their eye-level height in feet
For Kaylib:
For Addison:
Subtracting both distances we have:
Answer:
B. 2√2 mi
Where,
d: the distance they can see in thousands
h: their eye-level height in feet
For Kaylib:
For Addison:
Subtracting both distances we have:
Answer:
B. 2√2 mi