A right triangle has at least one angle that is a right angle (90 degrees)
50,57,79 none are 90 degrees
The triangle is not a right triangle
In order to answer the question, it's absolutely essential to have
enough of a description of the object to know which of its parts
'X', 'Y', and 'Z' are, and what other parts it may have.
An ideal way to accomplish this would have been for you to include the
picture that accompanies the question, wherever you copied it from.
First, we need to move the decimal point directly in front of the repeating part. To do this, we need to move it two places to the right, which we can do by multiplying by 100.
100 × 0.2045454545 = 20.45454545
Now we need to subtract our original number.

Now we put that over 99 (that's one less than our 100 from earlier)

Our fraction is shaping up, but we shouldn't have a decimal in there. Let's multiply the top and bottom by 100 to get rid of it.

We're going to have to do some simplifying. (the top and bottom are both clearly divisible by 5 and then some)

<em> done!</em>
The stem and leaf diagram is shown below
There are a total of 48 data
Question a:
The frequency in the stem for 9 to 9.9 is 13 data
Question b:
The location of the first quartile is given by

, where 'n' is the number of data
We have n = 48
Location of the first quartile is at

rounded down to 12
The value of the lower quartile is on the

on the diagram which is 8.7