Answer:
C= to find x, add the given angles
Step-by-step explanation:
The order of the 3 books does not matter so its the number of combinations of 3 from 45
b is the correct choice
Answer: well i think it is B
Step-by-step explanation:
<em>Hi!</em>
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<em>These can be set up as systems of equations.</em>
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<em>Let b = the number of birds, and let d = the number of dogs.</em>
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<em>b + d = 21</em>
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<em>2b + 4d = 76 (this is because birds have 2 legs and dogs have 4 legs.)</em>
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<em>You can solve this using either elimination or substitution.</em>
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<em>Consider marking brainliest.</em>