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german
2 years ago
12

A child standing on a river bank ten feet above the river throws a toward the river at a speed of 12 feet per second . How long

does it take before the rock splashes into the river ? Use the equation h=-16t^ 2 +vt+s
PLEASESE HELP
Mathematics
1 answer:
Anastasy [175]2 years ago
8 0
sure just give me head
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Brand X costs $2.70 for 10 ounces. Brand Y costs 4 cents more per ounces. What is the cost of 11 ounces of brand Y?
Ksju [112]
Well you have to first find the constant of Brand X which would be 2.70/10 = .27. Brand Y is .4 more so that would be .31 per ounce. So then .31 x 11 = 3.41. The cost of 11 ounces of brand Y is $3.41.
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2 years ago
What is the longest flagpole that could be shipped in a box that measures: 1 ft by 2 ft by 12 ft?
klemol [59]
A^2+b^2=C^2
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4+144=148
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Hope this helps
4 0
3 years ago
An unconfined compression test was performed to determine the average strength of concrete cylinders (in psi). It is believed th
Ronch [10]

Answer:

Explained below.

Step-by-step explanation:

(1)

The confidence level is, 91%.

Compute the value of α as follows:

\text{Confidence level}\% =(100-\alpha \%)\\\\91% = 100-\alpha \%\\\\\alpha \%=100-91\%\\\\\alpha \%=9\%\\\\\alpha =0.09

(2)

As the population standard deviation is provided, i.e. <em>σ</em> = 256 psi, the <em>z</em> value would be appropriate.

The <em>z</em> value for α = 0.09 is,

<em>z</em> = 1.69

(3)

Compute the 91% confidence interval as follows:

CI=\bar x\pm z_{\alpha/2}\cdot\frac{\sigma}{\sqrt{n}}

     =3000\pm 1.69\cdot\frac{256}{\sqrt{70}}\\\\=3000\pm 51.71\\\\=(2942.29, 3057.71)

(4)

The 91% confidence interval for population mean implies that there is a 0.91 probability that the true value of the mean is included in the interval, (2942.29, 3057.71) psi.

8 0
2 years ago
1. (5x2-2x+3) + (x2+x+2)
antiseptic1488 [7]
The answer is: x^2-x+15
3 0
2 years ago
A rectangular park is 5/6 miles wide and 1 5/7 miles long. What is the area of the park? Enter your answer as a mixed number in
bagirrra123 [75]

Answer:First we need to turn 1 5/7 into an improper fraction   7x1+5 = 12/7

12 / 7 x 5 / 6 = 60/42 ....reduced.....10/7

10/7 as a mixed number is 1 3/7

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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