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2 years ago

Pre calculus cos(sin^-1(4/7))

Mathematics

1 answer:

TEA [102]2 years ago

7 0

Answer:

$\frac{\sqrt{33} }{7}$

Step-by-step explanation:

Find the missing side of the right triangle by Pythagorean theorem:

$7^{2} = 4^{2} + x^{2}$

$x = \sqrt{33}$

The answer would be this over the hypotenuse.

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What are the zeros of the function f(x) = x4 − x2 − 2?

goblinko [34]

Answer:

x = ± $\sqrt{2}$ , x = ± i

Step-by-step explanation:

f(x) = $x^{4}$ - x² - 2

to find the zeros , equate f(x) to zero , that is

$x^{4}$ - x² - 2 = 0

using the substitution u = x² , then

u² - u - 2 = 0 ← in standard form

(u - 2)(u + 1) = 0 ← in factored form

equate each factor to zero and solve for u

u - 2 = 0 ⇒ u = 2

u + 1 = 0 ⇒ u = - 1

convert u back into terms of x

x² = 2 ( take square root of both sides )

x = ± $\sqrt{2}$

x² = - 1 ( take square root of both sides )

x = ± $\sqrt{-1}$ = ± i

8 0

1 year ago

Help me please

blsea [12.9K]

Answer:

1 is biased, 2 isn't, 3 is biased, 4 isnt

Step-by-step explanation:

If you ask a question to people in a group who are already clearly for a certain topic then it is biased. For survey to not be biased, the people need to be chosen at random. Ask students what their favorite class is, or ask flight attendants where their favorite destination to travel to is. Dont use a group who has any relation to the survey at hand. Asking band students about funding for band is biased, as well as asking people who are at a SOCCER GAME what their favorite sport is.

5 0

2 years ago

A turkey costs $1.05 per pound. There are going to be fifteen people at Thanksgiving dinner. Plan for each person to eat two, 3/

valina [46]

Answer:

<em>I will need to buy 22.5 pounds of turkey and pay $23.63</em>

Step-by-step explanation:

<u>Proportions</u>

Each person is planned to eat 2 x 3/8 pound servings of turkey for thanksgiving dinner. This means each person will eat

$2\cdot\frac{3}{4}=\frac{3}{2}$

pounds of turkey.

There are going to be 15 people at the dinner, thus the total turkey needed is:

$15\cdot\frac{3}{2}=22.5~pounds$

The turkey costs $1.05 per pound, thus the total cost is

22.5*$1.05 = $23.63

I will need to buy 22.5 pounds of turkey and pay $23.63

6 0

3 years ago

What value of x makes the equation true? 42/54= x/9 A. 2 B. 7 C. 14 D. 36

adoni [48]

B) 7 would make it true, since both 42/54 and 7/9= 0.77 repeating

7 0

3 years ago

Check my work??? I will add a picture plz tell me if im right its worth 50 points!!

kkurt [141]

yes it's the right answer

6 0

2 years ago