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mamaluj [8]
2 years ago
5

Please help me please

Mathematics
1 answer:
zloy xaker [14]2 years ago
7 0

Answer:

they are identical. proved below.

Step-by-step explanation:

  • formula:  sin(t)+sin(s) = 2sin(\frac{t+s}{2} )cos(\frac{t-s}{2} )

using the formula to proof:

sin9a+sin5a

2sin(\frac{9+5}{2})* cos(\frac{9-5}{2})

2sin7a * cos2a

True. proved that they are identical.

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If there are 75 people at a movie and 36% of them are men, how many men are at the movie?
Musya8 [376]

75 * .36 = 27 men

****************************************************************


8 0
2 years ago
Let a and b be real numbers satisfying a^3 - 3ab^2 = 47 and b^3 - 3a^2 b = 52. Find a^2 + b^2.
boyakko [2]

Answer: a²+b² = -99/2

Step-by-step explanation:

Since we are given two equations, this equations will be solved simultaneously to get a² and b²

a³ - 3ab² = 47 ... 1

b³ - 3a² b = 52... 2

From 1, a(a² - 3b²) = 47...3

From 2, b(b² - 3a²) = 52... 4

Adding 3 and 4, we have;

a²+b²-3b²-3a² = 99 (note that a and b will no longer be part of the equations as they have been factored out)

a²+b²-(3b²+3a²) = 99

(a²+b²) -3(b²+a²)= 99

Taking the difference we have

- 2(a²+b²) = 99

a²+b² = -99/2

8 0
3 years ago
Please assist me with this problem​
Nimfa-mama [501]

Answer:

  d.  about 50 times larger

Step-by-step explanation:

The given expressions for magnitude (M) can be solved for the intensity (I). Then the ratio of intensities is ...

  \dfrac{I_2}{I_1}=\dfrac{I_0\cdot 10^{M_2}}{I_0\cdot 10^{M_1}}=10^{M_2-M_1}=10^{4.2-2.5}\\\\=10^{1.7}\approx 50

The larger earthquake had about 50 times the intensity of the smaller one.

8 0
3 years ago
During basketball practice, you make 8 free throws out of 20 shots taken. Using
MArishka [77]

Answer:

if you make 4 free throws for every 10 shots taken you would make 20 out of 50 free throws

Step-by-step explanation:

7 0
2 years ago
What is 2/3(9+x)=5(4-x)
choli [55]
The answer should be 6. hope this helped
3 0
3 years ago
Read 2 more answers
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