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
alexgriva [62]
3 years ago
8

Which of these equations is always true?

Mathematics
1 answer:
Lera25 [3.4K]3 years ago
3 0

Answer:

sin(x) = cos(90°-x)

Step-by-step explanation:

Looking at the graphs of sin(x) and cos(x), you can see that the peaks of the graph are separated by a value of pi/2. If you convert that value into degrees, then the two graphs are separated by 90°. Another way of thinking is from the unit circle. sin(x) = 1 at 90°, and cos(x)=1 at 0°. The difference is still 90°

You might be interested in
An adult elephant that is 10 ft tall casts a shadow that is 15 ft long. Find the length of the shadow that is a 8 ft telephone b
Fittoniya [83]

Answer:

12 feet long bc of cross multiplying then dividing the product by 10 which gives you 12!

5 0
3 years ago
A total of 200 10-year-old children of similar intellectual abilities participated in a noise experiment in their classrooms. Th
Vladimir79 [104]

Answer:

The dependent variable for this experiment is the ability of students with similar intellectual abilities to recall the meaning of a symbol in a textbook one week after the start of the experiment which depends on the presence or absence of noise outside the classroom.

Step-by-step explanation:

In an experiment, the independent variable is the one whose value, form or outcome is not determined by any other variable in the experiment.

The dependent variable is the one whose value, form or outcome is determined by one or more other variable(s) in the experiment.

This experiment tests the abilities of students with similar intellectual abilities to recall the meaning of a symbol in a textbook one week after the start of the experiment.

This ability was made to depend on whether there was noise or no noise outside their classrooms.

Since, this variable to be measured is determined by another variable in the experiment, it is evident that this is the dependent variable for this experiment.

Hope this Helps!!!

6 0
3 years ago
Suppose that there are 15 antennas in a store, of which 3 are defective. Assume all the defectives and all the functional antenn
ohaa [14]

Answer:

Step-by-step explanation:

Total number of antenna is 15

Defective antenna is 3

The functional antenna is 15-3=12.

Now, if no two defectives are to be consecutive, then the spaces between the functional antennas must each contain at most one defective antenna.

So,

We line up the 13 good ones, and see where the bad one will fits in

__G __ G __ G __ G __ G __G __ G __ G __ G __ G __ G __ G __G __

Each of the places where there's a line is an available spot for one (and no more than one!) bad antenna.

Then,

There are 14 spot available for the defective and there are 3 defective, so the arrange will be combinational arrangement

ⁿCr= n!/(n-r)!r!

The number of arrangement is

14C3=14!/(14-3)!3!

14C3=14×13×12×11!/11!×3×2

14C3=14×13×12/6

14C3=364ways

7 0
3 years ago
A random sample of of 100 voters in a town is selected, and 24 are found to support an annexation suit. Find the 96% confidence
lbvjy [14]

Answer: 0.24 +/- 0.088 = (0.152, 0.328)

Step-by-step explanation:

The point estimate p is given by;

p= 24/ 100 = 0.24

Z value for 96% confidence interval is 2.05

The solution for the given confidence interval is derived using the equation

p +/- z√(pq/n)

Where p = 0.24 q= 1-p = 0.76, n=100 z= 2.05

= 0.24 +/- 2.05√(0.24×0.76/100)

= 0.24 +/- 2.05(0.0427)

=0.24 +/- 0.088

= ( 0.152, 0.328)

6 0
3 years ago
Please help with algebra!!! ill give brainliest
sattari [20]
Hello :) please refer to the pic below!

7 0
3 years ago
Read 2 more answers
Other questions:
  • A produce store sold 63 red apples. If the ratio of red apples to green apples sold was 7:2, what is the combined amount of red
    10·2 answers
  • In packing for a trip, Sarah puts three pairs of socks - one red, one blue, and one green - into one compartment of her suitcase
    7·1 answer
  • Place the indicated product in the proper location on the grid 3a^2-2a^3
    5·1 answer
  • What is the solution to the equation below?<br> log20x3 - 2 logx=4
    5·1 answer
  • Simplify (-2x)^4<br> a.) -16x^4<br> b.) -8x^4<br> c.) -2x^4<br> d.) 8x^4<br> e.) 16x^4
    10·1 answer
  • A ball is dropped from the top of a 83-m-high building. What speed does the ball have in falling 3.6 s?
    12·1 answer
  • Now that you know m and b, what is the equation of the line of best fit?
    7·1 answer
  • Square p and square q
    13·2 answers
  • Find Principal when Time = 5 years, Interest - $ 500; Rate = 5%
    5·1 answer
  • The Income-tax for the state of Kalamazoo is as follows:
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!