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velikii [3]
3 years ago
7

The law of cosines is a² + b² - 2abcosC = c². find the value of 2abcosC

Mathematics
2 answers:
taurus [48]3 years ago
7 0
\bf a^2+b^2-(2ab)cos(C)=c^2\implies a^2+b^2-c^2=(2ab)cos(C)
Elina [12.6K]3 years ago
3 0

Answer:

We need a diagram please

Step-by-step explanation:

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Rico made a function table to illustrate the rate he charges for mowing lawns. Complete the table. Then write a function rule fo
Lesechka [4]
I think the correct answer is C. i hope this helps

7 0
3 years ago
Find the distance between (-1,-2) and (8,9)
Rom4ik [11]

Answer:

\sqrt{202} units or 14.2 units (rounded to the nearest tenth)

Step-by-step explanation:

To find the distance between a pair of two points, use the distance formula  d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}. Substitute the x and y values of (-1,-2) and (8,9) into the formula and simplify:

d = \sqrt{(-1-8)^2+(-2-9)^2} \\d = \sqrt{(-9)^2+(-11)^2} \\d = \sqrt{81+121} \\d= \sqrt{202}  

So, as an exact answer, the distance is \sqrt{202} units.

(To find the decimal approximate of that answer, enter it into a calculator. This would make the decimal approximate 14.2 units, when rounded to the nearest tenth.)  

7 0
3 years ago
Read 2 more answers
9. A television regularly costs $180, but it is on sale for 40% off. There is a
Alexandra [31]

Answer:

C $113.40

Step-by-step explanation:

100%-40%=60%

$180x60/100

=$10800/100

=$108

100%+5%(tax)=105%

$108x105/100

=$11340/100

=$113.40 (C)

3 0
3 years ago
What is the range of the following function, if the domain is {1,3,12}?<br> f(x) = x - 3
Stella [2.4K]
I think this is the answer ( −∞,∞)
8 0
2 years ago
What is the sum of the interior angles of a 24 sided regular polygon? Show your work.
expeople1 [14]

Answer:

3,960 degrees

Step-by-step explanation:

The sum of interior angles of a polygon can be found using:

S= (n - 2)*180

where s is the sum, and n is the number of sides.

This is a 24 sided polygon. Therefore, substitute 24 in for n (number of sides).

S = (24 - 2)*180

Subtract inside the parentheses first

S= (22)*180

Multiply 22 and 180

S=3960

The sum of the interior angles of a 24 sided polygon is 3,960 degrees

7 0
3 years ago
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