because the x values are identical the radius would be found by subtracting the y values.
6-2 = 4
the radius is 4
Assuming there is no line under the "less than" sign, this means D + 4 < 7 solves to D < 3, which is what I'm assuming you got. This is found by subtracting 4 from both sides.
Writing D < 3 means D is some number less than 3. A solution is just that. You cannot pick 3 itself because 3 is not less than 3. But you can pick something like 2 since it is less than 3.
D+4 < 7
2+4 < 7 ... replace D with 2
6 < 7 ... true
Or D could be 1
D+4 < 7
1+4 < 7
5 < 7 .... true
and so on.
Assuming you mean simplified, 66/100=33/50, which can be achieved by dividing both the numerator and denominator by 2.

<h3><u>Solution </u><u>(</u><u>a)</u><u> </u><u>:</u><u>-</u></h3>

- <u>By </u><u>taking </u><u>LCM </u><u>of </u><u>the </u><u>given </u><u>denominators </u>


Hence, The answer is 47/30
<h3>
<u>Solution </u><u>(</u><u> </u><u>b</u><u>) </u><u> </u><u>:</u><u>-</u></h3>

- <u>By taking LCM of the given denominators </u>


Hence, The answer is 15/56
<h3>
<u>Solution </u><u>(</u><u> </u><u>c</u><u>) </u><u> </u><u>:</u><u>-</u></h3>

- <u>By taking LCM of the given denominators </u>



Hence, The answer is 27/26
<h3>
<u>Solution </u><u>(</u><u> </u><u>d</u><u>) </u><u> </u><u>:</u><u>-</u></h3>

- <u>By taking LCM of the given denominators</u>


Hence, The answer is 16/15
<h3><u>Solution </u><u>(</u><u> </u><u>e) </u><u>:</u><u>-</u></h3>

- <u>By taking LCM of the given denominators</u>


Hence, The answer is 25/77
<h3>
<u>Solution </u><u>(</u><u> </u><u>f</u><u>) </u><u>:</u><u>-</u></h3>

- <u>By taking LCM of the given denominators</u>


Hence, The answer is 95/36