3 years ago

Start Time 7:30 end time 9:29 what is the elapesed time

Mathematics

2 answers:

rodikova [14]3 years ago

4 0

Answer:

1 min 59sec

Step-by-step explanation:

aniked [119]3 years ago

4 0

Answer:

59 minutes is elapsed between 7:30 to 9:29

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Steps:

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If S = <img src="https://tex.z-dn.net/?f=%5Cfrac%7Bn%7D%7B2%7D" id="TexFormula1" title="\frac{n}{2}" alt="\frac{n}{2}" align="ab

andrew-mc [135]

Answer:

n = 20

Step-by-step explanation:

<u>Sum of an arithmetic series</u>

$S_n=\dfrac{n}{2}(a+l)$

where:

a = first term
l = last term
n = number of terms

Given:

$S_n=640$
$a=25$
$l=39$

Substituting the given values into the formula and solving for n:

$\implies 640=\dfrac{n}{2}(25+39)$

$\implies 640 \cdot 2=n(25+39)$

$\implies 1280=n(25+39)$

$\implies 1280=64n$

$\implies n=\dfrac{1280}{64}$

$\implies n=20$

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