Julie is 3 years older than her sister. Julie's age is 11 years old. How old is her sister?
1 answer:
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Answer:
see explanation
Step-by-step explanation:
(a)
(the side required )² = sum of squares of other 2 sides - ( 2 × product of other 2 sides and cos(angle opposite side required ) )
x² = 12² + 15² - (2 × 12 × 15 × cos71°)
(b)
x² = 144 + 225 - 360cos71°
= 369 - 360cos71° ( take square root of both sides )
x =
≈ 16 cm ( to the nearest integer )
Answer:
Step-by-step explanation:
Given
Required
is calculated as:
Since it is a probability with replacement, we have:
For x > 1, we have:
For x < 2, we have:
becomes