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Xelga [282]
2 years ago
13

BRAINLIESTT ASAP! PLEASE HELP ME :)

Mathematics
2 answers:
Rudiy272 years ago
8 0
<h3>Answer: D) none of the equations are identities</h3>

====================================

Work Shown:

I'm going to use x in place of theta.

let

f(x) = sin(x+2pi/4)

g(x) = sqrt(2)*sin(x)*cos(x)

Plug in x = 0

f(x) = sin(x+2pi/4)

f(0) = sin(0+2pi/4)

f(0) = sin(2pi/4)

f(0) = sin(pi/2)

f(0) = 1

and

g(x) = sqrt(2)*sin(x)*cos(x)

g(0) = sqrt(2)*sin(0)*cos(0)

g(0) = sqrt(2)*0*1

g(0) = 0

We see that f(0) = g(0) is not a true equation

Therefore, f(x) = g(x) is not true for all values of x, making it not be an identity. We can use a graph to compare f(x) and g(x) to see that they do not line up.

--------------------------------

Let

h(x) = cos(x-pi/3)

i(x) = (3/sqrt(2))*(cos(x) - sin(x))

Plug in x = 0

h(x) = cos(x-pi/3)

h(0) = cos(0-pi/3)

h(0) = 0.5

and

i(x) = (3/sqrt(2))*(cos(x) - sin(x))

i(0) = (3/sqrt(2))*(cos(0) - sin(0))

i(0) = 2.12

Like with equation 1, we do not have an identity since h(0) does not equal i(0). We only need one counter example since an identity states that h(x) = i(x) for all values of x in the domain.

Makovka662 [10]2 years ago
7 0

Answer:

2

Step-by-step explanation:

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a map has a scale of 3cm : 18 km. If riverside &amp; Smithville are 54 km apart they are how far apart on the map?
Finger [1]
Alright! To solve this one you first have to find out what 1cm is equal to in km, to do that you have to divide 18km by 3cm:

[18 ÷ 3] = 6.

Now we know that 1cm is 6km. To find how far apart they are on the map you simply divide 54km by 6km:

[54 ÷ 6] = 9.

They are 9cm apart on the map.
3 0
3 years ago
2y + 12 = -3x<br><br> solve pls i have more I WILL GIVE EXTRA POINTS!!!!!!!!!!<br> 20+
Mrac [35]

2y + 12 = -3x

Step-by-step explanation:

Divide y y by 1 1 . Divide 12 12 by 2 2 . Use the slope-intercept form to find the slope and y-intercept. The slope-intercept form is y=mx+b y = m x + b , where m m is the slope and b b is the y-intercept.

8 0
3 years ago
Marcello sells coupon books to his neighbors. 4 neighbors each buy 2 coupon books. There are 8 coupons in each book. What is the
docker41 [41]

Answer:

64

Step-by-step explanation:

Marcello sells coupon books to his neighbors

4 neighbors each buy 2 coupon books

Each book have 8 coupons

Therefore the total number of coupons that all neighbors will get can be calculated as follows

Each neighbor will get 16 coupon

Hence the whole neighbors will get

16×4

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8 0
3 years ago
WILL GIVE BRAINLIEST: If the graph of 2x+3y − 6=0 is perpendicular to the graph of ax − 3y=5. What is the value of a?
Ilya [14]

Answer:

a = \frac{9}{2}

Step-by-step explanation:

To find the value of a, find the Slope of both the equations.

For lines to be perpendicular to each other    m_{1}m_{2}  = - 1

For line 1:

2x + 3y − 6 = 0 represent the line in y=mx +c form

3y = -2x + 6

y = \frac{-2}{3} x + \frac{6}{3}

y = \frac{-2}{3} x + 2

m_{1} = \frac{-2}{3}

For line 2:

ax - 3y = 5

ax = 5 + 3y

ax - 5 = 3y

y = \frac{ax}{3} - \frac{5}{3}

m_{2} = \frac{a}{3}

Apply the condition of perpendicularity:

\frac{-2}{3} * \frac{a}{3} = - 1

\frac{2a}{9} = 1

a = \frac{9}{2}

7 0
3 years ago
Select each answer that is true
levacccp [35]

Answer:

rational

Step-by-step explanation:

5 0
3 years ago
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