Answer:
2.1275 is 2.12747677748 rounded to the nearest ten-thousandth.
Step-by-step explanation:
Since the hundred-thousandth place is 5 or above, we would round the ten-thousandths place up. THis makes the number 2.1275.
We know that the sum of all angle measures in a trapezoid is 360* (* means degrees)
Therefore we can construct the equation
(X+28)+(x)+(4x-14)+(4x-14)= 360
Now add like terms
10x = 360
And divide by the coefficient of X (aka 10)
X= 36
First make the denominators of the fractions the same by multiplying.

×

=

Now we just need to add the fractions together

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9/6 would be the answer, but it can be simplified further, then converted into decimal form.

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=
=1.5 yardsYour final answer is 1.5 yards of ribbon are needed.