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Vlada [557]
3 years ago
7

Help me with this assignment problem​

Mathematics
1 answer:
Rus_ich [418]3 years ago
3 0

Answer:

1/27

step by step explanation

1x1x1=1

3x3x3=27

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Factor –7x3 + 21x2 + 3x – 9 by grouping. What is the resulting expression?
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The answer is the third option

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I need help plz someone help me solved this problem I need help ASAP! I will mark you as brainiest!
valina [46]

Answer: k = 12

<u>Step-by-step explanation:</u>

x² + kx + 36 = 0

In order for x to have exactly one solution, it must be a perfect square.

(x + √36)² = 0

(x + 6)² = 0

(x + 6)(x + 6) = 0

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2 years ago
Given f(x)=-3x+4 , what is f(2) ?
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2 years ago
In the interval 0 x 360 find the values of x for which cos x =0.7252
Sergeeva-Olga [200]

Answer:

x_1 = 43.5145\°

x_2 = 316.4855\°

Step-by-step explanation:

We have a positive value for the cosine of x, so we know that the value of x should be in the first quadrant (0 ≤ x ≤ 90) or in the fourth quadrant (270 ≤ x ≤ 360).

Now, let's find the value of x that gives cos(x) = 0.7252 using the inverse function of the cosine, that is, the arc cosine function.

The value of x can be calculated using:

x = arccos(0.7252)

Using this function in a calculator (you may find it as: cos^{-1}(x)), we have that:

x_1 = 43.5145\°

So this is the value of x in the first quadrant. To find the other value of x, in the fourth quadrant, that gives the same result, we just need to calculate 360° minus the value we found:

x_2 = 360\° - 43.5145\° = 316.4855\°

So the values of x are:

x_1 = 43.5145\°

x_2 = 316.4855\°

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