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Alika [10]
2 years ago
11

What is the measure of angle A please HELP I’ll give you BRAINLIEST

Mathematics
1 answer:
k0ka [10]2 years ago
8 0

Answer:

Option (3)

Step-by-step explanation:

By applying cosine rule in the triangle ABC,

BC² = AC² + AB² - 2(AC)(AB)cosA

5² = 3² + 7²- 2(3)(7)cosA

25 = 9 + 49 - 42cos(A)

25 = 58 - 42cos(A)

cos(A) = \frac{33}{42}

A = \text{cos}^{-1}\frac{11}{14}

A = 38.21°

A ≈ 38°

Option (3) will be the correct option.

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Solve 15x + 2 = 47 (what is the value of the variable “x?”) *
Dima020 [189]

Answer:

x = 3

Step-by-step explanation:

15x + 2 = 47 \\ 15x = 47 - 2 \\ 15x = 45 \\ x =  \frac{45}{15}  \\ x = 3

7 0
3 years ago
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Does anybody know the answer 4-10 ?¿ i need help !
Alika [10]

Answer:

#7 is 4.7

Step-by-step explanation:

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3 0
2 years ago
Simplify and determine the coefficient of (-x)(5y)(-2x).<br><br> A. -4<br> B. 1/5<br> C. 1<br> D. 4
Mekhanik [1.2K]

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=(-5xy)(-2x)

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3 0
3 years ago
In one study, it was found that the correlation coefficient between two variables is -0.98. Which statement is true?
Vadim26 [7]

<u>Answer- </u>D. There is a strong negative association between the variables

<u>Solution-</u>

Properties of Correlation Coefficient

1-  Its value ranges between -1 and 1.

2- The greater the absolute value of correlation coefficient, the stronger is the linear relationship.

3- The weakest linear relationship is indicated by a correlation coefficient equal to 0.

4- A positive correlation means that if one variable gets bigger, the other variable tends to get bigger.

5- A negative correlation means that if one variable gets bigger, the other variable tends to get smaller.

As the given correlation coefficient is -0.98 (-ve), whose absolute value is 0.98 (closer to 1)

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2 years ago
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