1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
astraxan [27]
3 years ago
14

Please help I’m really confused and need to learn this

Mathematics
1 answer:
egoroff_w [7]3 years ago
6 0

Answer:

2.

Step-by-step explanation:

For #2, another way to word this question is: For which of the following trig functions is π/2 a solution? Well, go through them one by one. If you plug π/2 into sinθ, you get 1. This means that when x is π/2, y is 1. Try and visualize that. When y is 1, that means you moved off the x-axis; so y = sinθ is NOT one of those functions that cross the x-axis at θ = π/2. Go through the rest of them. For y = cos(π/2), you get 0. At θ = π/2, this function crosses the x-axis. For y = tanθ, your result is undefined, so that doesn't work. Keep going through them. You should see that y = secθ is undefined, y = cscθ returns 1, and y = cotθ returns 0. If you have a calculator that can handle trig functions, just plug π/2 into every one of them and check off the ones that give you zero. Graphically, if the y-value is 0, the function is touching/crossing the x-axis.

Think about what y = secθ really means. It's actually y = 1/(cosθ), right? So what makes a fraction undefined? A fraction is undefined when the denominator is 0 because in mathematics, you can't divide by zero. Calculators give you an error. So the real question here is, when is cosθ = 0? Again, you can use a calculator here, but a unit circle would be more helpful. cosθ = π/2, like we just saw in the previous problem, and it's zero again 180 degrees later at 3π/2. Now read the answer choices.

All multiples of pi? Well, our answer looked like π/2, so you can skip the first two choices and move to the last two. All multiples of π/2? Imagine there's a constant next to π, say Cπ/2 where C is any number. If we put an even number there, 2 will cut that number in half. Imagine C = 4. Then Cπ/2 = 2π. Our two answers were π/2 and 3π/2, so an even multiple won't work for us; we need the odd multiples only. In our answers, π/2 and 3π/2, C = 1 and C = 3. Those are both odd numbers, and that's how you know you only need the "odd multiples of π/2" for question 3.

You might be interested in
Two perpendicular lines intersect on the y-axis. the equation of one line is 4y - x - 24 =0. determined the equation of the othe
Taya2010 [7]

Answer:

y  + 4x - 6 = 0

Step-by-step explanation:

Rearranging the given equation:-

4y = x + 24

y = 1/4 x + 6  

This has a y intercept of  (0, 6) and a slope of 1/4.

Thus, the other line has a slope of -4 and  passes through the point (0,6) also.

Using the Point-slope form of a straight line:-

y - y1 = m(x - x1)

y - 6 = -4(x - 0)

y  + 4x - 6 = 0  is the required equation  

4 0
3 years ago
A cone has a diameter of 4 cm and a height of 11 cm. What is the volume 1 point
anzhelika [568]

Answer: 46.05

Step-by-step explanation:

1/3 * 3.14 * 4 * 11 = 46.05 (rounded to the tenth)

4 0
3 years ago
The segments shown below could form a triangle.<br><br> A. True<br> B. False
suter [353]

answer TRUE because they would make a triangle

7 0
3 years ago
Read 2 more answers
I cant remember this its not a test but i have more questions can someone pleas help
USPshnik [31]
Here, take any points (0, -2) ((1, -6)
Now, slope (m) = -6 - (-2) / 1 - 0 = -6+2 / 1 = -4

Now, y - y1 = m(x - x1)
y - (-6) = -4(x - 1)
y + 6 = -4x + 4
y = -4x - 2

In short, Your Equation would be y = -4x - 2

Hope this helps!
8 0
2 years ago
Regina spent $45.50 over 612 months on music downloads. If she spent the same amount of money each month, how much money did Reg
Flauer [41]
74c a month? Should/Could be the answer
5 0
3 years ago
Read 2 more answers
Other questions:
  • Help me pls I'm stuck......
    12·1 answer
  • A ray that divides an angle into two congruent angles.
    12·1 answer
  • George has opened a new store and he is monitoring its success closely.
    13·1 answer
  • What is y= 2x - 10 and y= 4x - 1
    12·1 answer
  • To decorate her bedroom, Jocelinde spent $54.11 on new bedding, $51.96 on paint, and 67.52 on accessories. About how much did sh
    12·1 answer
  • 3x^2+15x+25=−3x−2<br>whats the discrimate?​
    5·2 answers
  • If a regular polygon has 72 sides and an order of 72,what is the polygon’s rotational angle?
    6·1 answer
  • Which expression is equivalent to 6X equals 10 X +20
    9·1 answer
  • 4.<br> 122 - 4(6) + 1<br> Evaluate<br> 112<br> 122 - 4(6) + 1<br> 112
    8·1 answer
  • -4.3(9x-2.3)+2.21<br> i dont know the answer to the problem please help
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!