Angles on a straight line add up to 180°, so:
x + 60 = 180
x = 180 - 60
x = 120°
The current height of the bird is -16/3
The bird perched at a height of 15 feet
The bird dropped to a height of 61/3 feet when it saw a food
The current height can be calculated as follows
= 15 - 61/3
= 45-61/3
= -16/3
Hence the current height of the bird is -16/3
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You will need 6/4 or 1 1/2 cups of blueberries to make 48 muffins (2 dozen),