Answer:
3.6 divided by 3 = 1.2 so 1.2 yards of material can be used on each skirt.
Step-by-step explanation:
Based on the calculations, the unknown number is equal to 
- Let the unknown number be x.
<h3>How to find an
unknown number:</h3>
Translate the word problem into an algebraic expression, we have;
Adding 21 to the unknown number:

Multiplying the result by 3:

84 more than two-thirds of the unknown number:

Equating the equations, we have:

Cross-multiplying, we have:

Read more on word problems here: brainly.com/question/13170908
Answer:
7÷w=
Step-by-step explanation:
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The answer is <span>f(x) = sin pi over 215x
I just took the test</span>