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3 years ago

Simplify the expression 21z - 6z + 13

Mathematics

2 answers:

valentina_108 [34]3 years ago

4 0

Answer:

15z+13

Step-by-step explanation:

21z-6z+13

Combine like terms (21z+6z) [Because both of these numbers have a Z next to them]

15z+13

Bess [88]3 years ago

3 0

Answer:

15z+13

Step-by-step explanation:

hey! all we have to do is combine like terms.

21z-6z+13

15z+13

there's your answer.

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Answer:

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Step-by-step explanation:

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3 years ago

Solve the Law of Cosine: c^2 = a^2+ b^2 - 2abcosC for cos C.

Andrew [12]

Answer:

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Step-by-step explanation:

See the figure to understand the proof :

Let A Triangle ABC with sides a,b,c,

Draw a perpendicular on base AC of height H meet at point D

Divide base length b as AD = x -b and CD = x

By Pythagoras Theorem

In Triangle BDC And In Triangle BDA

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From above eq 1 and 2

c² = (a² - x²) + x² + b² - 2xb

or, c² = a² + b² - 2xb .....(3)

Again in ΔBDC

cos C = $\frac{BD}{BC}$

Or, cos C = $\frac{x}{a}$

∴ x= a cos C

Now put ht value of x in eq 3

I.e, c² = a² + b² - 2ab cos C

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