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3 years ago

7

The 7 digit numbers 74A52B1 and 326AB4C are each multiples of 3. Which of the following could be the value of C?

1 answer:

iren [92.7K]3 years ago

7 0

The answer is c I know because I had that problem two

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CosA + cosB + cosC = 1 + 4sinA/2 sinB/2 sinC/2

bulgar [2K]

$\cos(A) + \cos( B ) + \cos(C) \\ = 2 \cos( \frac{A + B}{2} ) \cos( \frac{ A- B}{2} ) + 1 - 2 { \sin }^{2} \frac{C}{2} \\ = 1 + 2\cos( \frac{\pi - C}{2} ) \cos( \frac{A - B}{2} ) - 2 { \sin }^{2} \frac{C}{2} \\ = 1 + 2 \sin \frac{C}{2} \cos( \frac{A - B}{2} ) - 2 { \sin }^{2} \frac{C}{2} \\ = 1 + 2 \sin \frac{C}{2} [ \cos( \frac{A - B}{2} ) - \sin \frac{C}{2}] \\ = 1 + 2 \sin \frac{C}{2} [ \cos( \frac{A - B}{2} ) - \cos( \frac{A + B}{2} )] \\ = 1 + 2 \sin\frac{C}{2} \times 2 \sin( \frac{ \frac{A + B}{2} +\frac{A - B}{2} }{2} ) \sin( \frac{ \frac{A + B}{2} - \frac{A - B}{2} }{2} ) \\ = 1 + 4 \sin \frac{A}{2} \sin \frac{B}{2} \sin \frac{C}{2}$

6 0

3 years ago

Write 45% as a decimal.

wlad13 [49]

Answer:

0.45

Step-by-step explanation:

Because you have to write 45% has money so 45.00 divide by 100 = 0.45 hope this is right and helpful. Can you mark me brainliest

3 0

3 years ago

PLEASE HELP THANK YOU

jasenka [17]

Answer:

74 deg

Step-by-step explanation:

Ok, so this is a bunch of steps.

8 0

3 years ago

1) Venn-diagram of-<br> AUBUC={a,b,c,d,e}U{d,e,f,g,h,i}U{a,e,i,o,u}<br>

Naddika [18.5K]

Answer:

AUBUC= { a,b,c,d,e,f,g,h,i,o,u}

7 0

3 years ago

A manufacturer produces televisions. He estimates that by selling them for x dollars each, he will be able to sell 230 – 3x each

poizon [28]

Answer:

Price per television =38.30

Step-by-step explanation:

Number of units sold in one week =230-3x

Price of one unit =x

Total money produced in one week =x(230 - 3x)

(Here it doesn't matter total money is taken for a week or day because after differentiating and equating to zero that factor disappear )

Differentiate total amount with respect to x.

$\frac{dM}{dt}=230-6x$

Now equate it equal to zero to get extremum.

230-6x=0

Then, x = 38.30

5 0

4 years ago