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VladimirAG [237]
3 years ago
14

Solve: sin^2 x + sin x cos x = 0

Mathematics
1 answer:
denis23 [38]3 years ago
3 0
Sin² x + sin x cos x = 0
sin x ( sin x + cos x ) = 0
sin x = 0 ;  x 1 = k π ;  k ∈ Z
sin x + cos x  = 0  / ²
sin² x + 2 sin x cos x + cos² x = 0
2 sin x cos x + 1  =0
sin ( 2 x ) = - 1
x = 3π / 2 + 2 kπ     / : 2
x 2 = 3π / 4 + kπ ;  k ∈ Z 


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Please helpppppppp:(((((((((((((((((((
Alja [10]

Answer:

The area is 243 square feet

Step-by-step explanation:

The perimeter of a rectangle is the sum of all four sides.

Two of the sides represent the length and two represent the width.

Given what we know and using l to represent the length and w to represent the width.

l + l + w + w = 72ft

or more concisely

2l + 2w = 72ft

The four sides all add together to equal 72ft

We also know that

l = 3w

This says the length is equal to 3 times the width

we have two unknowns, l and w, and now we have two related equations so we can solve for l and w.

The first thing we will do is replace l with 3w in the first equation because the second equation tells us that l is the same as 3w. Making the replacement gives us

2(3w) + 2w = 72ft

2 times 3w is 6w

6w + 2w = 72ft

6w plus 2w is 8w

8w = 72ft

Now if we divide both sides by 8 we maintain the equality since we are making the same change to both sides

8w / 8 = 72ft / 8

8w divided by 8 is 1w or just w and 72ft divided by 8 is 9ft

w = 9ft

So now we know the width is 9ft

if we now replace w with 9 in one of our original equations we can solve for l, let's use l = 3w

l = 3(9ft)

3 times 9 is 27 so

l = 27ft

So the length is 27ft which is 3 times the width of 9ft

The area of a rectangle is length times width or l x w, so

area = 27ft x 9ft

area = 243sqft

ft means feet and sqft means square feet

4 0
3 years ago
380102.804 word form
MrMuchimi
Three hundred eighty thousand, one hundred two and eight hundred four thousandths
7 0
3 years ago
Read 2 more answers
Last month, the daily balance in Joana's credit card account was $1,000 for 9 days, $750 for 10 days, $850 for 4 days, and $900
FrozenT [24]

Answer:

<em />Average = \$873<em />

<em />

Step-by-step explanation:

Given

$1000 for 9 days

$750 for 10 days

$850 for 4 days

$900 for other days

Required

Compute the daily average

First, we need to compute the number of days her balance is $900

Assuming the billing cycle is 30 days;

Number\ of\ days = 30 - (9 + 10 + 4)

Number\ of\ days = 30 - 23

Number\ of\ days = 7

The Average is then calculates using:

Average = \frac{\sum fx}{x}

Average = \frac{1000 * 9 + 750 * 10 + 850 * 4 + 900 * 7}{9 + 10 + 4+ 7}

Average = \frac{26200}{30}

Average = 873.333333333

<em />Average = \$873<em> --- Approximated</em>

3 0
3 years ago
Which of the following sets of numbers could represent the three sides of a right triangle?
NARA [144]

Answer:

16,30.34

Step-by-step explanation:

7 0
3 years ago
Please help me with this
Zarrin [17]
The two end points of our line are (0,2.5) and (5,5.5). to find our slope we need  to find our n difference (higher value - lower value) and our C difference (same as n) which would be 5 and 3. now we put our cost difference over our miles difference and get our slope (5/3). this means we still need out starting point. which is a cost of 2.5. the equation is C = (slope)5/3n + (starting value)2.5
7 0
3 years ago
Read 2 more answers
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