Important notes:
3 sides 1 angle - COSINE RULE
2 sides 2 angle - SINE RULE
since, the question wants to find the length of BC. In the end we will have 3 sides and 1 angle and use cosine rule
formula of cosine rule:
a² = b² + c² - 2bc Cos A° (to find the length)
Cos A° = b² + c² - a² / 2bc ( to find the angle, if there is given three sides and have to find the angle)
So just substitute,
a² = 13² + 15² - 2(13)(15) Cos 95°
a = 20.6 or 21
Step-by-step explanation:
option B is correct as,
10 + x = -18
→ x = -18 -10
→ x = -28
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Answer:
Step-by-step explanation:
we know that
The area of the right triangle ABC is equal to

we have



substitute the values





The formula to solve a quadratic equation of the form
is equal to
in this problem we have

so
substitute in the formula
therefore
The solution is
Answer:
$33.81
Step-by-step explanation:
(3 * 2.49) + (2 * 3.19) + (4 * 4.99)
7.47 + 6.38 + 19.96 = 33.81
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Answer:
-32x + 20
Step-by-step explanation: