Answer:
a₁₂ = - 4194304
Step-by-step explanation:
the nth term of a geometric sequence is
= a₁ ![(r)^{n-1}](https://tex.z-dn.net/?f=%28r%29%5E%7Bn-1%7D)
where a₁ is the first term and r the common ratio
here a₁ = 1 and r =
= - 4 , then
a₁₂ = 1 ×
= - 4194304
120 the formula for interior angles of a shape is ((n-2)180)n
You can use the regrouping
The correct answer is. v=25/2
Answer:
v = 80 mph
Step-by-step explanation:
Given that,
The distance from Wakefield to London is 180 miles.
The train travels this distance in 2 hours 15 minutes.
We need to find the average speed of the train. The average speed of the train is equal to the total distance covered divided by the time taken.
![v=\dfrac{d}{t}\\\\v=\dfrac{180\ miles}{(2+\dfrac{15}{60})\ h}\\\\v=80\ mph](https://tex.z-dn.net/?f=v%3D%5Cdfrac%7Bd%7D%7Bt%7D%5C%5C%5C%5Cv%3D%5Cdfrac%7B180%5C%20miles%7D%7B%282%2B%5Cdfrac%7B15%7D%7B60%7D%29%5C%20h%7D%5C%5C%5C%5Cv%3D80%5C%20mph)
So, the required average speed of the train is 80 mph.