How long would the string be in meters if it is 120 centimeters
1 answer:
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Answer:
the explicit formula for h(n) is, -65-10n
Step-by-step explanation:
Given that:
h(1) = -75
h(n) = h(n-1)-10 ......[1]
Put n =2 in [1] we have;
Similarly for n = 3
and so on...
The series we get;
This is an arithmetic sequence series with common difference(d) = -10
Since,
-85-(-75) = -85+75 = -10,
-95-(-85) = -95+85 = -10 and so on
First term(a) = -75
the Explicit formula for arithmetic sequence is given by:
where a is the first term,
d is the common difference and
n is the number of terms.
We have to find the explicit formula for h(n);
Substitute the given values we have;
or
Therefore, the explicit formula for h(n) is, -65-10n
Answer:
Mandy will take 67.5 mins to complete the 15 km race.
Step-by-step explanation:
Given:
Mandy runs 4 km in 18 min
She plans to run in a 15 km race.
We need to find how much time required to run 15 km.
4 km =18 min
15 km = time required for 15 km race
By Using Unitary method we get,
Time required for 15 km =
Hence time required by Mandy to complete 15 km race is 67.5 mins.