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3 years ago

Express the series in summation notation. 2 + 4 + 6 + 8 + 10 + 12

Mathematics

2 answers:

Olegator [25]3 years ago

7 0

Answer:

We can verify each sum by checking for the sum of one term, which is 2:

A. n = 1 ⇒ 2*1 = 2, correct
B. n = 1 ⇒ 2(2) = 4, incorrect
C. n = 1 ⇒ 1 + 2 = 3, incorrect

So A is the correct choice

baherus [9]3 years ago

3 0

Answer:

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Let f(x) = 1/x. Find a number b so that the average rate of change of f on the interval

Bezzdna [24]

Answer:

huh try multiplying

Step-by-step explanation:

6 0

3 years ago

The core melt- down and explosions at the nuclear reactor in Chernobyl in 1986 released large amounts of strontium-90, which dec

elena-14-01-66 [18.8K]

If $S(t)$ is the amount of strontium-90 present in the area in year $t$ , and it decays at a rate of 2.5% per year, then

$S(t+1)=(1-0.025)S(t)=0.975S(t)$

Let $S(0)=s$ be the starting amount immediately after the nuclear reactor explodes. Then

$S(t+1)=0.975S(t)=0.975^2S(t-1)=0.975^3S(t-2)=\cdots=0.975^{t+1}S(0)$

or simply

$S(t)=0.975^ts$

So that after 50 years, the amount of strontium-90 that remains is approximately

$S(50)=0.975^{50}s\approx0.282s$

or about 28% of the original amount.

We can confirm this another way; recall the exponential decay formula,

$S(t)=se^{kt}$

where $t$ is measured in years. We're told that 2.5% of the starting amount $s$ decays after 1 year, so that

$0.975s=se^k\implies k=\ln0.975$

Then after 50 years, we have

$S(50)=se^{50k}\approx0.282s$

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3 years ago

What is the solution set for z+10=z-2

photoshop1234 [79]

Answer: No Solution.

There are no values of z that make the equation true.

Step-by-step explanation:

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2 years ago

1) AL'S PLUMBING SERVICE CHARGES $35 PER

olga nikolaevna [1]

Answer:

Step-by-step explanation:

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2 years ago

I ONLY GOT 1 MIN!!!! PER QUESTION HELP

belka [17]

Answer:

your answer is

<h2>a traepoizd </h2>

Step-by-step explanation:

reason ----

1 parallelogram 

it is opposite side quadrilateral
opposite angle

2 rhombus 

four congruence side in rhombus

3 traepoizd 

one pair of congruent sides that were not parallel. It also had one pair of parallel lines.

4 kite 

two pair of quadrilateral adjacent

<h2>hope it's helpful thanks please mark me as brainlist please </h2>

4 0

2 years ago

Read 2 more answers