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Snowcat [4.5K]
3 years ago
8

A=2 b=2 c=1 Find the value of 2abcosC

Mathematics
1 answer:
mel-nik [20]3 years ago
6 0

Answer:

2abCosC = 1

Step-by-step explanation:

The cosine rule is

=> a^2= b^2+c^2-2abCosC

For 2abCosC, it becomes

=> 2abCosC = b^2+c^2-a^2

=> 2abCosC = (2)^2+(1)^2-(2)^2

=> 2abCosC = 1

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5 The Young family is replacing their central air-conditioning with a high- efficiency unit that costs $11798. The family is off
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12742.84$

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2 years ago
Which is the equation of a line that has a slope of -2/3 ans passes through the point (-3, -1)
kupik [55]

Answer:

see explanation

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

here m = - \frac{2}{3}, hence

y = - \frac{2}{3} x + c ← is the partial equation

To find c substitute (- 3, - 1) into the partial equation

- 1 = 2 + c ⇒ c = - 1 - 2 = - 3

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5 0
3 years ago
Hey there guys could anyone help me out here? tutors are unavailable and help would really be appreciated.
Scilla [17]

Answer:

50 degrees

Step-by-step explanation:

because it is a parallelogram, angle B = angle D, and angle C = angle A

that means we have 130(2) = 260 degrees that we know.

the total interior angles of a parallelogram = 360

360 - 260 = 100 degrees left. BUT because those are the total amount of angles left, those are angles A and C combined, so you have to divide 100 in half to get the angle A/ angle DAB

100/2 = 50 degrees. hope this helps! leave a question if you are still confused.

5 0
3 years ago
Read 2 more answers
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