I assume you mean, that an angle and two sides are known.
A formula that can be used for irregular triangles is the cosine rule.
'b' and 'c' must be sides that are beside the angle 'A' (angle opposite 'a').
Answer: 
Step-by-step explanation:
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The exercise is:</h3><h3>
"Dana loves rocks! She has 6 pieces of granite, 3 pieces of marble, 14 pieces of sandstone, and 1 piece of slate. What is the ratio of pieces of sandstone to pieces of marble in Dana's collection?"</h3><h3>
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You can use ratio to compare values.
By definition, ratios can be written in the following form:
In this case, you know that the number of pieces of different rocks that Diana has in her collections, are:
Since you must compare the number of pieces of sandstone and the number of pieces of marble in Dana's collection, you need to write the following ratio:
84 the process is shown in the following picture
6 times $0.97 plus $2.64 minus 20 equals $11.54 remaining on the gift card.
