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11111nata11111 [884]
3 years ago
5

You bought 0.40 lb of spinach for $2.38. how much did the spinach cost per pound?δz

Mathematics
1 answer:
coldgirl [10]3 years ago
6 0
$2.38/0.40 lb = $5.95/1 lb
The spinach cost $5.95 per pound.
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1 + tan ² Ф=sec²Ф
1+(12/5)²=sec²Ф
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sec Ф=⁺₋√(169/25)=⁺₋13/5

sec Ф=1/cos Ф ⇒cosФ=1/sec Ф
 cos Ф>0   ⇔  sec Ф>0  ⇔  sec Ф=+ 13/5

cos Ф=1/secФ
cos Ф=1 / 13/5=5/13

we can calculate the sin Ф, with this method.
sin²Ф + cos²Ф=1  ⇒ sin Ф=⁺₋√(1-cos² Ф)
sin Ф=⁺₋√[1-(5/13)²]=⁺₋12/13
like cos Ф>0 and tan Ф>0   ⇒ sin Ф>0 ⇒sin Ф=12/13

answer: d.12/13

other method
tan Ф=sin Ф / cos Ф
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answer: d.12/13

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