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3 years ago

What is the sum of the first 40 even intergers? A.1720 B.1840 C.1580 D.1640

Mathematics

1 answer:

3241004551 [841]3 years ago

4 0

Answer:

if so 2130.12548...x^2

THATS BOT REALLY THE ANSWER.. I JUST REALLLY NEED TO LVL UP.. IM SO SORRY :(

Step-by-step explanation:

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A table and I chairs weigh 235.68 lbs together. If the table weighs 157.84 lbs what is the weight of one chair in pounds

anzhelika [568]

Answer: 77.84

Step-by-step explanation: you subtract 235.68 and 157.84 and that is you answer,

4 0

3 years ago

Read 2 more answers

The lifetime of a certain type of battery is normally distributed with mean value 15 hours and standard deviation 1 hour. There

KIM [24]

Answer:

If the lifetime of batteries in the packet is 40.83 hours or more then, it exceeds for 5% of all packages.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 15

Standard Deviation, σ = 1

Sample size = 4

Total lifetime of 4 batteries = 40 hours

We are given that the distribution of lifetime is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

Standard error due to sampling:

$\displaystyle\frac{\sigma}{\sqrt{n}} = \frac{1}{\sqrt4} = 0.5$

We have to find the value of x such that the probability is 0.05

P(X > x) = 0.05

$P( X > x) = P( z > \displaystyle\frac{x - 40}{0.5})=0.05$

$= 1 -P( z \leq \displaystyle\frac{x - 40}{0.5})=0.05$

$=P( z \leq \displaystyle\frac{x - 40}{0.5})=0.95$

Calculation the value from standard normal z table, we have,

$\displaystyle\frac{x - 40}{0.5} = 1.64\\x = 40.825 \approx 40.83$

Hence, if the lifetime of batteries in the packet is 40.83 hours or more then, it exceeds for 5% of all packages.

8 0

3 years ago

What number multiples to -12 and adds to 4 (factoring: diamond method)

Marizza181 [45]

Answer: - 2 and 6

Step-by-step explanation:

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3 years ago

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Coral spent half of her weekly allowance playing mini-golf. To earn more money her parents let her wash the car for $4. What is

Juliette [100K]

X=weekly allowance
x/2=money saved (= money spent).
We can suggest this equation:

x/2+4=12

lowest common multiple=2
x+8=24
x=24-8
x=16

Answer: her weekly allowance is $16.

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3 years ago

Alan borrowed $570 for a new bed. He made 9 monthly payments to repay the loan. He

stepladder [879]

$~~~~~~ \textit{Simple Interest Earned} \\\\ I = Prt\qquad \begin{cases} I=\textit{interest earned}\dotfill &\$45\\ P=\textit{original amount deposited}\dotfill & \$570\\ r=rate\to r\%\to \frac{r}{100}\\ t=months\dotfill &9 \end{cases} \\\\\\ 45 = (570)(\frac{r}{100})(9)\implies \cfrac{45}{(570)(9)}=\cfrac{r}{100}\implies \cfrac{1}{114}=\cfrac{r}{100} \\\\\\ \cfrac{100}{114}=r\implies \stackrel{\%}{0.88}\approx r$

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2 years ago