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blagie [28]
3 years ago
13

Sin ( 90 + theta ) = cos theta prove^

Mathematics
1 answer:
liberstina [14]3 years ago
5 0
We will use additional formula:
sin ( 90°+ theta ) = sin 90° * cos(theta) + cos 90° * sin(theta)=
= 1 * cos(theta) + 0 * sin(theta)= cos (theta)           It is proved.
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c) 75

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3 years ago
The fifth grade teachers took their classes on a field trip to museum first group had 25 students and two teachers and cost $97.
iren [92.7K]

Answer:


Step-by-step explanation:

S=student cost; T=teacher cost

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32S+3T=$127 . Multiply this by 2.

64S+6T=$254 Subtract this below

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25S+2T=$97.50 . Multiply this by 3.

75S+6T=$292.50

64S+6T=$254 . Subtract this (from above.)

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11S=$38.50

S=$3.50

ANSWER 1: Student tickets cost $3.50.


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32($3.50)+3T=$127

$112+3T=$127

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T=$5.00

ANSWER 2: Teacher tickets cost $5.00.

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CHECK:

25S+2T=$97.50

25($3.50)+2($5.00)=$97.50

$87.50+$10.00=$97.50

$97.50=$97.50


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3 years ago
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5(5x+4)=45

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subtract 20 on each side

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divide by 25 on each side

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3 years ago
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