Like all questions where you need to write the answer, you should begin by clicking into the answer box. This will open the special keyboard.
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This question asks students to type an equation, so the special keyboard has been set to appear. The equation involves a square root symbol, which is available on the basic special keyboard, and includes x and y as variables.
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Before you start to enter your answer, note if there is part of what you might enter that is already present; in this case, y= has already been provided, and so you do not need to enter that part. Therefore, you will begin with 5.

You can either use the 5 key on your physical device or the 5 on the special keyboard. Then, use the square root key in the upper right of the special keyboard:

Keys like the square root that have a dotted rectangle outline (or more than one) indicate that you will enter the value(s) in that space. Once you've entered the square root you'll see that your cursor is under the symbol in the space indicated by the rectangle, allowing you to enter the value that goes in the square root symbol. Note that the square root symbol extends to cover the characters entered here.

Once you've typed the values that go inside the square root symbol you need to move your cursor out of the square root before typing +4. You can use the arrow keys on your physical device to move the cursor or you can use the left and right arrows in the lower left of the special keyboard:

Note that next to the word "Basic" (which indicates that this is the basic spacial keyboard) words appear describing the key in use. To see this for other keys you can hover your cursor over the key.

Once you've moved your cursor to the right you can type +4 and the square root symbol won't extend further:

Make sure that you do not place characters inside a symbol like square root that do not belong there.

Here is a question that requires an answer using the letter A, in both upper and lower case:

You will notice that while the Basic special keyboard includes the common variables x and y it does not include the letter A in either case. You can type the letter using the physical keyboard on your device, or you can change the special keyboard being displayed. To do this, click the arrow next to "Basic" in the upper left corner of the special keyboard to open the keyboards menu:

If you select the second keyboard shown here, the alphanumeric keyboard, the special keyboard will change to a regular QWERTY keyboard, with numerals 1-9 and 0, all the letters in the English alphabet, and a colon, comma, and period:

Note that the shift key in the lower right corner has been selected, and the keyboard is therefore showing uppercase letters. If it is unselected you will see and be able to type lowercase letters.

This keyboard can be used to type the upper and lower case letters required by the question. Note that questions that use special keyboards distinguish between upper and lower case letters, and you cannot interchange case without being marked wrong.

In this instance you should use the alphanumeric keyboard to type a lowercase a, then return to the basic keyboard to add the square using the x squared button:

Then you can add the plus sign using the basic keyboard, and return to the alphanumeric keyboard to add the capital A. The final result looks like this:

Here is a question that requires an answer using the letter A, in both upper and lower case:

Instead of changing the special keyboard being displayed, you can use the physical keyboard on your device to type the letter a in lower case, then use the x squared button as above to enter the power, the plus button on the special keyboard (or on your physical device), and then use your physical keyboard to type the capital A. This will give the same result as the method described above.

To enter fractions you can use the fraction keys on the basic special keyboard:

The key on the left allows you to create a fraction with whatever term you have just entered as the numerator, and the key on the right allows you to create a fraction next to the term you have just entered.

To enter the equation shown, start by entering b squared, which will be the numerator of your fraction. Then, click the fourth key from the right in the second row (called "fraction using previous expression as numerator"):

Tip: You can also use the slash button on your physical keyboard to accomplish this.

Your cursor will automatically go to the denominator, and you can enter 5 there:
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Use the right arrow key which is second from the left on the bottom row to move your cursor out of the denominator and enter the minus 3 as normal:

Here is a question that asks the student to enter Ag2SO4 with the numbers as subscripts:

You can either use the alphanumeric keyboard to type the letters for the chemical symbols, or you can use the physical keyboard on your device. After entering the relevant chemical symbol (in this case Ag for silver; note that capitalization matters in chemical symbols) make sure to open the Chem keyboard to enter the subscripts. Click the Subscript button then enter the appropriate number:

After entering the correct number for a given subscript, use the "move cursor right" key to remove your cursor from the subscript before entering the next chemical symbol. If you are using both sub and superscripts you can also use it to move between the different blanks available to you.

Use the alphanumeric special keyboard or your device's keyboard to enter the next chemical symbol(s), then return to the Chem keyboard and add the next subscript:

This problem asks the student to "Write the notation for an isotope of carbon with mass number 12 and atomic number 6." These mass and atomic number notations will go before the chemical symbol (C), with the mass number on top and the atomic number on the bottom.

To begin entering the relevant sub- and superscript values click the atomic symbol key. You will be given spaces to write sub- and superscripts at the start of your answer:

Once you've entered the superscript you can use the "move cursor left" key (the leftmost key on the bottom row of the Chem keyboard) to move your cursor into the subscript position or you can click into the subscript position:

Once you have entered the subscript you can move your cursor all the way to the right in order to enter the atomic symbol, in this case C for Carbon. This can be done either with your physical keyboard or with the alphanumeric special keyboard. The final answer looks like this:

In this question, you can see the difference between the letter x and the multiplication symbol. The question asks the student to enter a lowercase X in the first blank and a multiplication/times symbol in the second.

To write a lowercase x you need to be in the alphanumeric special keyboard or the basic special keyboard, or use the physical keyboard on your device. The basic keyboard has x and y variables, so you can use that to enter the lowercase X:

You can use either the Chem keyboard or the Basic keyboard to enter the multiplication symbol; both keyboards have the operation keys down the center. The multiplication symbol is the fourth key from the left in the second row:

You can see that in the boxes where they have been entered the multiplication symbol and the letter x do not look the same. The x is thicker, and slightly asymmetrical, with one line thicker than the other, while the multiplication sign has very thin lines which are both of the same thickness. Make sure that you use the correct character in your assignments.

This problem asks the student to write five dollars in one blank and five thousand dollars in the second. The first blank has a dollar sign before the blank, so the symbol does not need to be included in that entry, but the second does not have a dollar symbol, and therefore does need the symbol to be entered.

For the first blank in the example you can use the special keyboard to write 5.00 without a dollar sign:

For the second blank in the example you need to begin your answer with a dollar sign, because there isn't one present already: