sabaahmed900 sabaahmed900
  • 02-10-2020
  • Mathematics
contestada


a
2
=
b
2
+
c
2
−
2
b
c
cos
A
Evaluate
cos
A
given that
a
=
8
,
b
=
6
and
c
=
7
.

Respuesta :

Erlea
Erlea Erlea
  • 02-10-2020

Answer:

a^2=b^2+c^2- 2bc cosA

64= 36+ 49 - 2(6)(7)cos A

64- 85 = 84cos A

84 cosA= -21

cos A= -21/84

cosA= -0.25

Answer Link

Otras preguntas

The chair stood up straight and tall
The American colonies turned into ________ following the American Revolution. A. Territories B. States C. Colonies (A is wrong!)
Write 2 1/4 miles in 3/4 hour as a unit rate.
7. What is ultraviolet radiation?
10) Identify the adverbial clause in the following sentence. Janie never liked green Christmas cookies until she learned that food coloring is harmless. until s
List and explain with 3-5 bullet points in space below about how history and clothing are intertwined? Intertwined means what connections things have to each ot
How does social and environmental responsibility fight social challenges? ​
Can someone please help me with these four questions?? Much thanks!!! 1. Which of the following cell types are part of the innate immune system? Select all that
I don’t know what too write
7(4n-9) - 3(n-7)Use the Distributive Property towrite an equivalent expression.​