Need done asap !!

Mathematics

1 answer:

damaskus [11]1 year ago

4 0

PointA is (-8,4)
PointB is (8,-4)
Rate of change is -1/2

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Each minute, a faucet allows 4/9 gallons of water to enter a large tub, and the drain allows 8/9 gallons to leave the tub.

Ronch [10]

Answer:

Step-by-step explanation:

The amount of water in the bathtub per minute:4/9-8/9=-4/9;

liquid after:1/3* (-4/9)=-4/27

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3 years ago

What is the product (7x10^-5)x(5x10^-8) in scientific notation

uranmaximum [27]

Well 7x10^-5 would mean you moved the decimal 5 Times because the power at the end of 10 is how many times the decimal is moved till it’s a number greater or equal to 1. So the scientific notation of that is: 0.00003

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4 years ago

The article "Influence of Penetration Rate on Penetrometer Resistance" (see textbook for reference) presents measures of penetra

snow_tiger [21]

Answer:

The 95% of confidence interval for the mean penetration resistance for this soil is (2.0823, 3.1977).

Step-by-step explanation:

The sample size is 15.

The first step to solve this problem is finding how many degrees of freedom there are, that is, the sample size subtracted by 1. So

$df = 15-1 = 14$

Then, we need to subtract one by the confidence level $\alpha$ and divide by 2. So:

$\frac{1-0.95}{2} = \frac{0.05}{2} = 0.025$

Now, we need our answers from both steps above to find a value T in the t-distribution table. So, with 14 and 0.025 in the t-distribution table, we have $T = 2.145$ .