Domestication of plants and animals led to stable food supplies during the Holocene; however, it also resulted in significant environmental and health problems. What were these problems? (300 words minimum).

Do this in python with code that I can copy and run

Design and implement class Radio to represent a radio object. The class defines the following attributes (variables) and methods:

Assume that the station and volume settings range from 1 to 10.

1. A private variable of type int named station to represent a station number. Set to
2. A private variable of type int named volume to represent the volume setting. Set to 1.
3. A private variable of type boolean named on to represent the radio on or off. Set to false.
4. A non-argument constructor method to create a default radio.
5. Method getStation() that returns the station.
6. Method getVolume() that returns the volume.
7. Method turnOn() that turns the radio on.
8. Method turnOff() that turns the radio off.
9. Method stationUp() that increments the station by 1 only when the radio is on.
10. Method stationDown() that decrements the station by 1 only when the radio is on.
11. Method volumeUp() that increment the volume by 1 only when the radio is on.
12. Method volumeDown() that decrements the volume by 1 only when the radio is on.
13. Method toString()to printout a meaningful description of the radio as follows(if the radio is on):

The radio station is X and the volume level is Y. Where X and Y are the values of variables station and volume. If the radio is off, the message is: The radio is off.

Now design and implement a test program to create a default radio object and test all class methods on the object in random order. Print the object after each method call and use meaningful label for each method call as shown in the following sample run.

Sample run:

Turn radio on:

The radio station is 1 and the volume level is 1.

Turn volume up by 3:

The radio station is 1 and the volume level is 4.

Move station up by 5:

The radio station is 6 and the volume level is 4.

Turn volume down by 1:

The radio station is 6 and the volume level is 3.

Move station up by 3:

The radio station is 9 and the volume level is 3.

Turn radio off.

The radio is off.

Turn volume up by 2: The radio is off.

Turn station down by 2: The radio is off.

An engineer is studying the effect of cutting speed on the rate of metal removal in a machining operation. However, the rate of metal removal is also related to the hardness of the test specimen. Five observations are taken at each cutting speed. The amount of metal removed y and the hardness of the specimen x are shown below in the format of a data file. Column 1 has treatment (1 for cutting speed 1000, 2 for cutting speed 1200, 3 for cutting speed 1400), column 2 has x=hardness, column 3 has y=amount of metal removed.
1 125 77.4
1 120 68.4
1 140 90.4
1 150 97.9
1 136 87.6
2 133 85.4
2 140 94.4
2 125 74
2 120 64.8
2 165 112.1
3 130 79.6
3 175 117.6
3 132 82.3
3 141 91.9
3 124 72.9


Do an analysis of these data and include the following.
1. A scatterplot of the ys versus the xs, using different symbols (or colours) to distinguish the points corresponding to different cutting speeds. Do the ys appear to be related to the xs? Include regression lines of y versus x for each cutting speed. Does it seem reasonable to believe that these three lines have the same slope?
2. An ANCOVA table.
3. An ANOVA table based on the ys, disregarding the xs, to determine whether there are differences in the (mean) amount of metal removed for different cutting speeds. Comment on differences with part (2).

You will be asked a few questions concerning the analysis.

Please use 3 decimal places for the answers below which are not integer-valued.


Part a)
The type II SS for cutting speed (treatment) is______ and its degree of freedom is______    

Part b)
The MSE for ancova is:______    and its degree of freedom is______    

Part c)
The appropriate F ratio for cutting speed is:
______  ​

Part d)
What is the estimate slope for x=hardness?
______  

Suppose that 26 mL of 0.10 M HCl is added to 1.000 L of saturated Mg(OH)2' which contains more than enough Mg(OH)2(s) to react with all of the HCl.

A.) After the reaction has ceased, what will the molar concentration of Mg2+ be?

B.) What will the pH of the solution be?

1. Cherry hill Inc.’s balance sheet is shown below:

Cherry hill wishes to acquire equipment worth US$20,000. It can either buy
it by borrowing the required amount at a 10% rate of interest or it can
take it on lease for a period of 5 years. If it leases it, the lease rental would
be US$5276 per year. Assume taxes are absent.
Show the balance sheet of Cherry hill Inc. if:
(a) It finances the equipment with debt
(b) It leases the equipment as an operating lease
(c) It leases the equipment as a financial lease (hint: find the present
value of lease rentals at a discount rate of 10%)

Freezing point depression experiment

1/what effect does the presence of a nonvolatile solute have upon the freezing point of a solution?

2/Explain the diffrence between molarity and molality. What are the units on each?

3/what is the molality of a solution that contains 5.2g of urea(molar mass = 60g/mol)in 250g of benzene(c6H6)?

1) As a software engineer what are your legal and ethics responsibilities when you work for medical and military application?

2) What are the two levels of system design? Describe their corresponding main purpose briefly

3) What is double blind test? How to use this test to objectively compare the goodness of two software system, (e.g... google vs Bing.)

4) Define and Describe the main pros and cons of three software cost estimation methods

Compare the following concepts ( state the respective definitions and the difference)

- understandability vs user-friendliness

-software debugging vs. software testing

-black-box testing vs white-box testing

-software re-engineering vs reverse software engineering

Prepare a report for management, stating the advantages and disadvantages of each depreciation method. Include in the report your recommendations on the choice of method consistent with the requirements of IAS 16/AASB 116. Support your recommendations with schedules showing the total annual cost of operating the machinery, and the profit after depreciation.

The transactions of Spade Company appear below. Kacy Spade, owner, invested $11,250 cash in the company in exchange for common stock. The company purchased office supplies for $326 cash. The company purchased $6,221 of office equipment on credit. The company received $1,328 cash as fees for services provided to a customer. The company paid $6,221 cash to settle the payable for the office equipment purchased in transaction c. The company billed a customer $2,385 as fees for services provided. The company paid $530 cash for the monthly rent. The company collected $1,002 cash as partial payment for the account receivable created in transaction f. The company paid $1,200 cash in dividends to the owner (sole shareholder). Required: 1. Prepare general journal entries to record the transactions above for Spade Company by using the following accounts: Cash; Accounts Receivable; Office Supplies; Office Equipment; Accounts. Payable; Common Stock; Dividends; Fees Earned; and Rent Expense. Use the letters beside each transaction to identify entries. 2. Post the above journal entries to T-accounts, which serve as the general ledger for this assignment.

Two methods of maintenance for indefinite service life are being evaluated:

Method 1. The first cost would be $60,000, and $25,000 would be required at five-year intervals forever.

Method 2. The first cost would be $150,000, and $180,000 would be required at 50-year intervals of forever.

At I i = 12%, which method is the better one?

Describe how you would adapt the RGB color model in WebGL to allow you to work with a subtractive color model.

Answer question 2!!

1. a boat is bobbing up and down on the water as waves pass underneath it. The depth of the water under the boat oscillates between 3 m and 4 m. The boat is stationary with respect to the shore and it is 2.9s between the crests of successive waves. A person on shore sees the crests of the wave passing by at 2 m/s. what is the distance between crests of this wave?

2. Two ducks are floating close together on the water near the boat in problem 1. When the first duck is on the peak of a passing wave the second duck is 30 cm below it and moving upwards. How far apart are the ducks?

Cyber Security class

1. Your task is to compute a session key KAB in Diffie-Hellman Key Exchange (DHKC) with Elliptic Curves. Your private key is a = 6. You receive Bob’s public key B = (5,9). The elliptic curve being used is defined by y2 ≡ x3+x+6 mod 11.

2. In RSA Digital Signature, Suppose Bob wants to send a signed message (x = 4) to Alice. The first steps are exactly the same as it is done for an RSA encryption: Bob computes his RSA parameters and sends the public key to Alice. We know p = 3, q =11, and bob choose e=3. (Hint: We learn RSA algorithm and key generation in Week 7)

(a) What is the public key pair Bob sends to Alice?

(b) What is the value of signature s?

(c) What is the value of verkpubA(x,s)? Show all intermediate steps clearly.

Prove in RSA digital signature, verkpubA(x,s) = x

public class ValidBST {


    class BSTTest<Key extends Comparable<Key>, Value> {
        private Node root;             // root of BST

        private class Node {
            private Key key;           // sorted by key
            private Value val;         // associated data
            private Node left, right;  // left and right subtrees

            public Node(Key key, Value val) {
                this.key = key;
                this.val = val;
            }
        }

    }


    public boolean isValidBST(BSTTest bst) {






        return false;
    }

    public static void main(String[] args) {

    }
}

In 2014, MusicLand has credit sales of $400,000. MusicLand also has $50,000 in accounts receivable on December 31, 2014. MusicLand has a $200 credit balance in allowance for uncollectible accounts before adjusting entries.

Assume that MusicLand uses B/S approach to estimate bad debt expense and allowance for uncollectible accounts. MusicLand estimates that 5% of accounts receivable are uncollectible. Find bad debt expense for 2014 and allowance for uncollectible accounts at the end of 2014.