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andrezito [222]
3 years ago
15

Which of the following is a solution to 2cos2x − cos x − 1 = 0?\

Mathematics
1 answer:
goblinko [34]3 years ago
5 0

Answer:

Option A is correct.

Solution for the given equation is,

Step-by-step explanation:

Given that : Let then our equation become; .....[1]

A quadratic equation is of the form:

.....[2] where a, b and c are coefficient and the solution is given by;

Comparing equation [1] and [2] we get;

a = 2 b = -1 and c =-1

then;Simplify:or and

Simplify:y = 1 and

Substitute y = cos x we have;⇒and⇒

The solution set:  

Therefore, the solution for the given equation   is, 0 degrees

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Bogdan [553]

Answer:

A. 430 pounds

Step-by-step explanation:

The almonds is 43 times as much as the hours.

43*10=430 pounds

3 0
3 years ago
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Help Its math Im stuck!
Romashka [77]
C is correct.


Reasoning: If the top number (numerator) is smaller that the bottom number (denominator), it means it’s smaller than 1. If, on the other hand, the numerator is bigger than the denominator, it means it’s more than 1. If youre ever unsure, devide the numerator by the denominator. This will turn the number into a decimal, and be easier to see. 8/9 = 0.88 repeated, and 3/7 = 0.4285. Therefore 8/9 is larger than 3/7. This can also be written as 8/9 > 3/7.

Good luck!
7 0
3 years ago
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Determine the numbers of solutions for 5x + 12 = 12x + 5.
mylen [45]

Answer:

Step-by-step explanation:

5x + 12 = 12x + 5

-7x + 12 = 5

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x = 1

one solution

8 0
3 years ago
Which is the best estimate for the product of 3,826.301 × 175.6?
dem82 [27]
If you round 3,826.301 and 175.6 to the nearest hundred you will get 3,800 and 200.

Multiply 3,800 * 200 = 760000

760,000 rounded to the nearest hundred thousand is 800,000.

The best estimate for the product 3,826.301 × 175.6 is B. 800,000. 
7 0
3 years ago
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The weather man predicts a 35% chance of rain today. He predicts a 60% chance of rain tomorrow. What is the probability that it
sineoko [7]

Answer:

21%.

Step-by-step explanation:

This would be 0.35*0.60 = 0.21 or 21%.

The probabilities are multiplied because the 2 events are independent.

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3 years ago
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