Use the law of sines to solve the triangle.
6.) a=60 degrees, a=9, c=10

sinA /a = sin C / c

sin 60/9 = sin C / 10

(√3/2)/9 = sinC/ 10

√3/18 = sin C / 10

so c will be sin inverse ((10√3)/10)

Step-by-step explanation:

discount of 25% means you're paying (100% -25%) = 75% of the original price. An additional discount of 20% means you're paying (100% -20%) = 80% of the discounted price. In the end, you're paying

 $3.00*75%*80% = $1.80

The final price of the cereal is $1.80.

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