8.6E-10 in standard form

Trevor bought an antique desk. The net value of the desk is equal to the resale value of the desk minus what Trevor paid to buy

mel-nik [20]

Answer: 1st one

Step-by-step explanation:

6 0

4 years ago

Read 2 more answers

Is 196, 28, 4, 4/7, a geometric sequence?

Paul [167]

Answer:

no

Step-by-step explanation:

If there is a common ratio between consecutive terms in the sequence then it is geometric, that is

$\frac{28}{196}$ = $\frac{1}{7}$

$\frac{4}{28}$ = $\frac{1}{7}$

$\frac{4}{\frac{4}{7} }$ = 4 × $\frac{7}{4}$ = 7

There is not a common ratio between consecutive terms, thus

The sequence is not geometric

7 0

3 years ago

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How heavy a load (pounds) is needed to pull apart pieces of wood 4 inches long and 1.5 inches square? Here are data from student

statuscvo [17]

Answer:

a. (29526.192 , 32155.808)

b. (29673.9301 , 32008.0699)

Step-by-step explanation:

on calculation, we find that sample mean = 30843 and sample standard deviation = 3018.504, and n=20

1)

Sample Mean = 30841

SD = 3000

Sample Size (n) = 20

Standard Error (SE) = SD/root(n) = 670.8204

alpha (a) = 1 - 0.95 = 0.05

z critical value for 95% confidence interval:

z(a/2) = z(0.025) = 1.96

Margin of Error (ME) = z(a/2) x SE = 1314.808

95% confidence interval is given by:

Sample Mean +/- (Margin of Error) = 30841 +/- 1314.808

= (29526.192 , 32155.808)

2)when std dev of population is not known, we use sample's, but we have to use t instead of z

Sample Mean = 30841

SD = 3018.504

Sample Size (n) = 20

Standard Error (SE) = SD/root(n) = 674.958

alpha (a) = 1-0.9 = 0.1

we use t-distribution as population standard deviation is unknown

t(a/2, n-1 ) = 1.7291

Margin of Error (ME) = t(a/2,n-1)x SE = 1167.0699

90% confidence interval is given by:

Sample Mean +/- (Margin of Error)

30841 +/- 1167.0699 = (29673.9301 , 32008.0699)

4 0

3 years ago

Find the student’s error in solving the following inequality.

hram777 [196]

Step-by-step explanation:

When dividing both sides of an equality by a negative number, the sign should be changed:

25 < -5x

-5 > x

x < -5

6 0

4 years ago

A manufacturer has determined that a model of its washing machine has an expected life that is Exponential with a mean of four y

krek1111 [17]

Complete question:

A manufacturer has determined that a model of its washing machine has an expected life that is Exponential with a mean of four years to failure and irrelevant board burn-in period. He wants to testthe system and complete data collection. Find the probability that one of these washing machines will have a life that ends: (Note you can find the reliability of the washing machine life)

a) After an initial four years of washing machine service

b) Before four years of washing machine service are completed

c) Not before six years of washing machine service.

Answer:

a) 0.3679

b) 0.6321

c) 0.2231

Step-by-step explanation:

Given:

Mean, u= 4

/\ = 1/u

= 1/4 = 0.25

The cummulative distribution function, will be:

For x≥0,

$F(x) = 1 - e^-^0^.^2^5^X$

$P(x$

a) After an intial four years:

$P(x>4) = 1-(1-e^-^0^.^2^5^*^4^.^0)$

P(x>4) = 0.3679

b) Before four years:

$P(x$

P(x<4) = 0.6321

c) Not before 6 years:

$P(x>6) = 1-(1-e^-^0^.^2^5^*^4^.^0)$

P(x>6) = 0.2231

5 0

3 years ago