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3 years ago

Help asaaaap pls !!!!!

Mathematics

1 answer:

tatyana61 [14]3 years ago

7 0

Answer:

Step-by-step explanation:

for (10,5)

5 - 5 = 2(10 - 10) = 0

for (4,-7)

-7 - 5 = 2(4 - 10) = -12

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Precalculus PLEASE HELP ME right answers only check all please

Alex_Xolod [135]

Given :

$cos(x)cos(\frac{\pi }{7}) + sin(x)sin(\frac{\pi }{7})=-\frac{\sqrt{2}}{2}$

We know the identity

$cos(x)cos(y) + sin(x)sin(y)=cos(x-y)$

We use this property to simplify the left hand side

So $cos(x)cos(\frac{\pi }{7}) + sin(x)sin(\frac{\pi }{7})=cos(x - \frac{\pi }{7})$

$cos(x - \frac{\pi }{7}) =-\frac{\sqrt{2}}{2})$

we know ,

when $cos(x) =-\frac{\sqrt{2}}{2})$ then

$x = \frac{3\pi }{4} , \frac{5\pi }{4}$

For $cos(x - \frac{\pi }{7}) =-\frac{\sqrt{2}}{2})$

$x - \frac{\pi }{7}= \frac{3\pi }{4} and x - \frac{\pi }{7}= \frac{5\pi }{4}$

Add $\frac{\pi }{7}$ on both sides

$x= \frac{3\pi }{4} + \frac{\pi }{7} and x= \frac{5\pi }{4} +\frac{\pi }{7}$

Finally we add 2npi for general solution

So options C and D are correct

6 0

3 years ago

What is the solution of the linear equation (4−5) − (2+3) = (7−6)? * pls fast

maxonik [38]

Answer:

no solution

Step-by-step explanation:

1.4-5-2-3=7-6

2.-1-2-3=7-6

3.-3-3=7-6

4.-6=7-6

5.-6=1

6.since -6=1 is false, there's no solution

4 0

3 years ago

What’s the distance between (-3,-5) and (-2,-4)

joja [24]

Answer:

2.82843

Step-by-step explanation:

it was what i got

3 0

3 years ago

Read 2 more answers

REWARDING BRAINLY FOR CORRECT ANSWER

ivann1987 [24]

Answer:

Mean: 58

Median: 58

Step-by-step explanation:

The mean is a type of average. It is the sum (total) of all the values in a set of data, such as numbers or measurements, divided by the number of values on the list. To find the mean, add up all the values in the set. Then divide the sum by how many values there are.
The median is the middle number; found by ordering all data points and picking out the one in the middle

FINDING THE MEAN:

57 + 54 + 59 + 57 + 61 + 58 + 60 = 406

406 ÷ 7 = 58

FINDING THE MEAN:

Arrange the numbers from smallest to greatest:

54, 57, 57, 58, 59, 60, 61

Find the median number:

54, 57, 57, 58, 59, 60, 61

The median is: 58

7 0

3 years ago

Read 2 more answers

4-(2y-1)=2(5y+9)+y please help quick

stich3 [128]

Step-by-step explanation:Step 1: Simplify both sides of the equation.

4−(2y−1)=2(5y+9)+y

4+−1(2y−1)=2(5y+9)+y(Distribute the Negative Sign)

4+−1(2y)+(−1)(−1)=2(5y+9)+y

4+−2y+1=2(5y+9)+y

4+−2y+1=(2)(5y)+(2)(9)+y(Distribute)

4+−2y+1=10y+18+y

(−2y)+(4+1)=(10y+y)+(18)(Combine Like Terms)

−2y+5=11y+18

Step 2: Subtract 11y from both sides.

−2y+5−11y=11y+18−11y

−13y+5=18

Step 3: Subtract 5 from both sides.

−13y+5−5=18−5

−13y=13

Step 4: Divide both sides by -13.

−13y

−13

y=−1

Answer: y =-1

7 0

3 years ago

Read 2 more answers

Help asaaaap pls !!!!! ​

Help asaaaap pls !!!!!