All categories

3 years ago

If sin x = .42, what is cos x?

1 answer:

3 0

$We\ know:\\\\\sin^2x+\cos^2x=1\to\cos^2x=1-\sin^2x\to\cos x=\sqrt{1-\sin^2x}\\\\\sin x=0.42\\subtitute\\\\\cos x=\sqrt{1-0.42^2}=\sqrt{1-0.1764}=\sqrt{0.8236}\approx0.91$

You might be interested in

2 Evaluate the following expression when x = 2. x3 + 7x + 2

bogdanovich [222]

Answer:

Step-by-step explanation:

Since x is 2 wherever you see x put 2

solve x3 + x7+ 2

=(2)3 + (2)7 + 2

= you do the number outside the bracket multiplied by the number inside the bracket

like this

=(2 × 3) + (2 × 7) + 2

= 6+ 14 + 2

= 22

5 0

3 years ago

WHAT WOULD THIS BEEEE!??

liq [111]

Answer:

Angle 4 = 99 degrees

Step-by-step explanation:

Vertical Angles add up to 180

180-81= 99

4 0

3 years ago

Can I get some help pls and no links pls i'm getting tired of getting links

just olya [345]

53.2

40%=.4
.4 times 38 = 15.2
15.2+38=53.2

Thank me later

3 0

3 years ago

The table of values represents a function f(x).

TiliK225 [7]

Answer:

- The interval [9, 10] is 1,375% greater than the interval [5, 8].

- The interval [9, 10] is 14.75 times greater than the interval [5, 8].

Step-by-step explanation:

1. To solve this problem you must apply the following formula:

$AverageRateOfChange=\frac{y_{2}-y_{1}}{x_{2}-y_{1}}$

2. Let's calculate the average rate of change of each interval:

a) Interval [9,10]:

$=\frac{11,014-4,052}{10-9}=6,962$

b) Interval [5,8]:

$=\frac{1,491-75}{8-5}=472$

3. The difference is:

$6,962-472=6,490$

4. In percentage:

$(\frac{6,962-472}{472})(100)=1,375%$

5. You have that the interval [9,10] is 14.75 times greater than the interval [5,8], as you can see below:

$\frac{6,962}{472}=14.75$

3 0

4 years ago

Read 2 more answers

A bag contains 10 marbles: 3 are green, 2 are red, and 5 are blue. Ashley chooses a marble at random, and without putting it bac

Butoxors [25]

(1).probability of getting a red marble is.

total number of red marble is 2.

total number of marble is 10.

$p(e) = \frac{2}{10} = \frac{1}{5}$

(2). probability of getting a blue marble is

total number of blue marble is 3.

total number of marble in bag is 9

$p(e) = \frac{3}{9} = \frac{1}{3}$

6 0

3 years ago