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

-9x² - 4 + 6x + 11x² - 7x
Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of “significant digits!”20.94 mol/L x 46. L= ? mol2.094
Problem 14Find the graph of the line whose equation is Sy - 20 = -3XHint: The first step is to express the given equation in the form slope y-intercept: y = mx
Suppose the lake by your house as 198,000 gallons. But its volume grew by 3000 every weekWrite an equation modeling the number of gals in the lake after so many
There were 55.5 million people enrolled in Medicare in 2015. In 2009, there were 46.6million enrolled. Which value best represents the unit rate of change (slop
1 5/6 - (-2 4/5)[tex]1 \frac{5}{6} - ( - 2 \frac{4}{5} )[/tex]
Solve the system of equations using elimination.8x - 5y = 13-16x - 10y = -6Show your work here:Solution:
Determine the number of significant figures in the measurement 77.09 m.Express your answer numerically as an integer.
A line has an x-intercept of 12 and a y-intercept of -4. What is the equation of theline?
If the equation 6X equals 84, what is the next step in the equation solving sequence?