3 years ago

The expression sin 80 cos 70 + cos 80 sin 70 is equivalent to

Mathematics

1 answer:

vekshin13 years ago

8 0

Sin(70+80) = sin 150.......................

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Find m∠U. Write your answer as an integer or as a decimal rounded to the nearest tenth.

antiseptic1488 [7]

Answer:

Answer:

50.2

Step-by-step explanation:

$ut = \sqrt{ {6}^{2} + {5}^{2} } \\ \sqrt{36 + 25} \\ \sqrt{61 } \\ using \: cosine \: rule \\ cos \: u = \frac{ {5}^{2} + 61 - 36 }{2 \times 5 \times \sqrt{61} } \\ \\ = \frac{25 + 61 - 36}{78} \\ \\ = \frac{50}{78 } \\ \cos \: u = 0.64 \\ m \:u = 50.2$

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3 years ago

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ololo11 [35]

Answer:

A=5

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divide both sides by 15

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3 years ago

3x^2-x=10 Find factors Determine zeros

Sophie [7]

Factors are (3x + 5) and (x - 2). Zeros are -5/3 and 2.

Step-by-step explanation:

Step 1: Given quadratic equation 3x² - x = 10 ⇒ 3x² - x - 10 = 0

Step 2: Use factoring method (product and sum rule) to find factors and zeros. So the equation can be written as below.

⇒ 3x² - 6x + 5x - 10 = 0

⇒ 3x(x - 2) + 5(x - 2) = 0

⇒ (3x + 5)(x - 2) = 0 These are the factors of the equation.

Step 3: Find zeros by equating the factors to 0.

⇒ 3x + 5 = 0 and x - 2 = 0

⇒ x = -5/3 and 2

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4 years ago

A) When 3 is subtracted from a number, the result is 8.

mestny [16]

Answer:

Step-by-step explanation:

check:

3+8=11

11-3=8

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4 years ago

Read 2 more answers