C= X+ H solve for C write the answer in the comments plz

HELP ME !!!!?? Brainliest if right

djverab [1.8K]

The correct answer is b

3 0

3 years ago

Simplify. 3.3÷(0.8−3)−0.5 Enter your answer in the box.

Veseljchak [2.6K]

Answer:

-2

Step-by-step explanation:

3.3÷(0.8−3)−0.5

First think of PEMDAS

So first do parenthese

(0.8-3)=-2.2

3.3÷-2.2-0.5

Now do division

3.3/-2.2=-1.5

and now subtraction

-1.5-0.5=-2

6 0

3 years ago

Read 2 more answers

Nikhil gets paid a 5 percent commission on every pair of shoes that he sells. He earned $1.00 on the last pair of shoes that he

atroni [7]

Answer: C.20.00

Step-by-step explanation:

I just took the test

6 0

3 years ago

Someone help me on this question please !

mezya [45]

Given that the elevator can only hold 4 people and that "people" could be either men "M" or woman "W", the possible combinations are as follows

WWWW = 0 men, 4 women = (0,4)

MWWW = 1 man, 3 women = (1,3)

MMWW = 2 men, 2 women = (2,2)

MMMW = 3 men, 1 woman = (3,1)

MMMM = 4 men, 0 woman = (4,0)

3 0

3 years ago

Solve sinX+1=cos2x for interval of more or equal to 0 and less than 2pi

Igoryamba

Answer:

Question 1: $\sin(x)+1=\cos^2(x)$

Answer to Question 1: $x=0, \pi \frac{3\pi}{2}$

Question 2: $\sin(x)+1=\cos(2x)$

Answer to Question 2: $0,\pi,\frac{7\pi}{6}, \frac{11\pi}{6}$

Question:

I will answer the following two questions.

Condition: $0\le x$

Question 1: $\sin(x)+1=\cos^2(x)$

Question 2: $\sin(x)+1=\cos(2x)$

Step-by-step explanation:

Question 1: $\sin(x)+1=\cos^2(x)$

Question 2: $\sin(x)+1=\cos(2x)$

Question 1:

$\sin(x)+1=\cos^2(x)$

I will use a Pythagorean Identity so that the equation is in terms of just one trig function, $\sin(x)$ .

Recall $\sin^2(x)+\cos^2(x)=1$ .

This implies that $\cos^2(x)=1-\sin^2(x)$ . To get this equation from the one above I just subtracted $\sin^2(x)$ on both sides.

So the equation we are starting with is:

$\sin(x)+1=\cos^2(x)$

I'm going to rewrite this with the Pythagorean Identity I just mentioned above:

$\sin(x)+1=1-\sin^2(x)$

This looks like a quadratic equation in terms of the variable: $\sin(x)$ .

I'm going to get everything to one side so one side is 0.

Subtracting 1 on both sides gives:

$\sin(x)+1-1=1-\sin^2(x)-1$

$\sin(x)+0=1-1-\sin^2(x)$

$\sin(x)=0-\sin^2(x)$

$\sin(x)=-\sin^2(x)$

Add $\sin^2(x)$ on both sides:

$\sin(x)+\sin^2(x)=-\sin^2(x)+\sin^2(x)$

$\sin(x)+\sin^2(x)=0$

Now the left hand side contains terms that have a common factor of $\sin(x)$ so I'm going to factor that out giving me:

$\sin(x)[1+\sin(x)]=0$

Now this equations implies the following:

$\sin(x)=0$ or $1+\sin(x)=0$

$\sin(x)=0$ when the $y$ -coordinate on the unit circle is 0. This happens at $0$ , $\pi$ , or also at $2\pi$ . We do not want to include $2\pi$ because of the given restriction $0\le x$ .

We must also solve $1+\sin(x)=0$ .

Subtract 1 on both sides:

$\sin(x)=-1$

We are looking for when the $y$ -coordinate is -1.

This happens at $\frac{3\pi}{2}$ on the unit circle.

So the solutions to question 1 are $0,\pi,\frac{3\pi}{2}$ .

Question 2:

$\sin(x)+1=\cos(2x)$

So the objective at the beginning is pretty much the same. We want the same trig function.

$\cos(2x)=\cos^2(x)-\sin^2(x)$ by double able identity for cosine.

$\cos(2x)=(1-\sin^2(x))-\sin^2(x)$ by Pythagorean Identity.

$\cos(2x)=1-2\sin^2(x)$ (simplifying the previous equation).

So let's again write in terms of the variable $\sin(x)$ .

$\sin(x)+1=\cos(2x)$

$\sin(x)+1=1-2\sin^2(x)$

Subtract 1 on both sides:

$\sin(x)+1-1=1-2\sin^2(x)-1$

$\sin(x)+0=1-1-2\sin^2(x)$

$\sin(x)=0-2\sin^2(x)$

$\sin(x)=-2\sin^2(x)$

Add $2\sin^2(x)$ on both sides:

$\sin(x)+2\sin^2(x)=-2\sin^2(x)+2\sin^2(x)$

$\sin(x)+2\sin^2(x)=0$

Now on the left hand side there are two terms with a common factor of $\sin(x)$ so let's factor that out:

$\sin(x)[1+2\sin(x)]=0$

This implies $\sin(x)=0$ or $1+2\sin(x)=0$ .

The first equation was already solved in question 1. It was just at $x=0$ .

Let's look at the other equation: $1+2\sin(x)=0$ .

Subtract 1 on both sides:

$2\sin(x)=-1$

Divide both sides by 2:

$\sin(x)=\frac{-1}{2}$

We are looking for when the $y$ -coordinate on the unit circle is $\frac{-1}{2}$ .

This happens at $\frac{7\pi}{6}$ or also at $\frac{11\pi}{6}$ .

So the solutions for this question 2 is $0,\pi,\frac{7\pi}{6}, \frac{11\pi}{6}$ .

8 0

3 years ago

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