After 5 new students joined a class, the class had 35 students. Which equation can be used to find n, the number of students in
2 answers:
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Answer with Step-by-step explanation:
We are given that
u+ v and u-v are orthogonal
We have to prove that u and v must have the same length.
When two vector a and b are orthogonal then
By using the property
We know that
Magnitude is always positive
When power of base on both sides are equal then base will be equal
Therefore,
Hence, the length of vectors u and v must have the same length.
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For more explanation, please see the attachment
For more explanation, please see the attachment
Answer:
∠ ABC ≈ 137.9°
Step-by-step explanation:
Using the Cosine rule in Δ ABC
cos B =
with a = 89, b = 144, c = 65
cos B = =
=
, thus
B = ( -
) ≈ 137.9° ( to the nearest tenth )