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
QveST [7]
3 years ago
14

Solve this pleaseplease​

Mathematics
1 answer:
tamaranim1 [39]3 years ago
6 0

Answer:

Step-by-step explanation:

cos(2a) = cos^2(a) - sin^2(a)

cos(2a) = 2cos^(a) - 1

cos(2a) = 11/25

11/25 = 2 cos^(a) - 1             Add 1 to both sides

1 + 11/25 = 2 cos^2

25/25 + 11/25 = 2 cos^2(a)

36/25 = 2 cos^2 (a)            Divide by 2

36/50 = cos^2 (a)               Take the square root of both sides.

6/5*sqrt(2) = cos(a)            

You might be interested in
Find the slope of the line that passes through the given points.
12345 [234]

Finding the slope using two points:

The formula for slope is

\frac{y_{2}-y_{1}}{x_{2}-x_{1}}

In this case...

y_{2} =-7\\y_{1} =2\\x_{2} =4\\x_{1} =-3

^^^Plug these numbers into the formula for slope...

\frac{-7 - 2}{4 - (-3)}

\frac{-9}{6}

^^^Reduce this fraction

\frac{-3}{2}

^^^This is your slope

Hope this helped!

~Just a girl in love with Shawn Mendes

5 0
3 years ago
What’s the length of IG
stira [4]

Answer:

Therefore,

Length of IG is 16 units.

Step-by-step explanation:

Given:

ΔGHI

∠I ≅ ∠H

GH = 16

HI = 5

To Find:

IG = ?

Solution:

In ΔGHI

∠I ≅ ∠H          ..............Given

Base angles are equal.

∴  ΔGHI is an Isosceles Triangle  

∴ GH ≅ IG  .............Property of an Isosceles Triangle

But GH = 16    ...Given

∴ IG = 16 .........Transitive Property

Therefore,

Length of IG is 16 units.

6 0
3 years ago
Read 2 more answers
Sara's grades are 78, 72, 66, 80, and 84. Sara decides to study hard for the final. Her score is 100. As an outlier, how does
kirill115 [55]

Answer:

B

Step-by-step explanation:

The Mean(Average) of 78+72+66+80+84 is 76 because (78+72+66+80+84)/5* and (78+72+66+80+84+100)/6* is 80.

*You get this number by counting the number of numbers you entered (78+72+66+80+84) there are 5 numbers.

3 0
3 years ago
Write an algebraic expression to represent the following verbal expression
DaniilM [7]
The answer is B. They are saying to cube the difference therefore you have (x-43) cubed
4 0
3 years ago
Read 2 more answers
Resolve into factors:- 9x4 + 2x²y²+ y4​
makvit [3.9K]

Answer:

(3x^2+y^2+2xy)(3x^2+y^2-2xy)

Step-by-step explanation:

9x^4+2x^2y^2+y^4

(3x^2+y^2+2xy)(3x^2+y^2-2xy)

Both terms are perfect squares. So you will factor using the difference of squares formula. a^2-b^2=(a+b)(a-b)

Take what the square is for every term.

9x^4. What squared is 9? 3 and take half of the power or 2. That's how you get the 3x^2

2x^2y^2 is the same way. 2xy and 2xy

y^4 is y but dived he powers by 2 to get y^2.

Take one of each and but in () like I have above.

4 0
3 years ago
Other questions:
  • a carpenter cuts of from a plank 5/12 of its length and then 6/7 of what remains.Of the remaining piece is 2/1/2 m long.find the
    6·1 answer
  • Find the take home percent of the gross pay: net pay $298.76, gross pay $402.38. round to the nearest percent.
    6·1 answer
  • Express your answer in scientific notation 4.9x10^5-5.8x10^4
    11·1 answer
  • an appliance store decreases the price of a 19-in. television set 26% to a sale of $463.98. what was the original price?
    15·1 answer
  • What is the place value of 7 in these numbers?
    7·1 answer
  • What is the equation for this word problem?:
    14·1 answer
  • Please help asap! will give 20 points
    5·2 answers
  • When three times a number is subtracted from 36, the result is 4 plus the number. What is the number?
    8·1 answer
  • Given the figure above, if​
    6·1 answer
  • What is 9+12-4x15+3 divided by 2
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!