3 years ago

Need help on these asap please

Mathematics

1 answer:

Elenna [48]3 years ago

5 0

9.6958 rounded to the nearest hundredth is 9.70
-
44cm

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What is the sum of the numbers in the series? 15 + 11 + 7 + . . . + (–129)

babymother [125]

Using Gauss's method
Total number of terms = [15-(-129)]/4+1=36+1=37
Add
S=15+11+7+....-125-129
S=-129-125-...+7+11+15
--------------------------------
2S=-114-114-114...(37 times)
=>
sum=S=(1/2)*(-114)*37=-2109

Using AP, T(n)=15+11+7+....-129
T(n)=19-4n => T(1)=15, T(37)=-129
S(n)=(1/2)(37)(T(1)+T(37)=(1/2)37(15-129)=2109

3 0

3 years ago

Heart beats 2,320 times during 20 minutes of rowing. While resting the heart is beating 16 times in 15 seconds. What is the diff

Mrac [35]

Answer: 0.87 times per second (Or 52.2 times per minute)

Step-by-step explanation:

You need to make the conversion from minutes to seconds.

Remember that 1 minute has 60 seconds. Then 20 minutes to seconds is:

$(20minutes)(\frac{60seconds}{1minute})=1,200seconds$