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AaronMicrosoft15
11.01.2020 •
Mathematics
Marissa bought 3 sweaters on sale for the same price. after using a coupon for $25, the total cost was $80. write an algebraic equation to represent the situation. how much did each sweater cost?
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Ответ:
3S-25=80
add 25 to both sides
3S= 105
divide both sides by 3
1 sweater costs $35
Ответ:
a. Recall the double angle identities:
Then
Applying the identity again, we have
as required.
b. Using the result from part (a),
(where
is any integer)