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
guapka [62]
3 years ago
5

The sum of (a + b) + c is equal to the sum of a + ( b + c) as explained by the ————.

Mathematics
2 answers:
nataly862011 [7]3 years ago
6 0
Associative property. associativity is a valid rule of replacement for expressions in logical proofs
natima [27]3 years ago
3 0

Answer:

It is distributive property

You might be interested in
How do I do this scientific notation problem?
lidiya [134]
You take the exponent and move that many places with the number that you get on the opposite side
3 0
3 years ago
Read 2 more answers
Not tryna be weird or nun but if anyone would like to join my g0ogle classroom for help with advice for teens from teens AGES 13
boyakko [2]

Answer:

ight

Step-by-step explanation:

I'll think bout it.

I may join, but I won't be on that much.

6 0
3 years ago
Is these correct bro
iren [92.7K]

Answer:

yes

Step-by-step explanation:

if my eyes are good then yes

3 0
3 years ago
Prove that sinA-sin3A+sin5A-sin7A/cosA-cos3A-cos5A+cos7A= cot2A
MAVERICK [17]
Write the left side of the given expression as N/D, where
N = sinA - sin3A + sin5A - sin7A
D = cosA - cos3A - cos5A + cos7A
Therefore we want to show that N/D = cot2A.

We shall use these identities:
sin x - sin y = 2cos((x+y)/2)*sin((x-y)/2)
cos x - cos y = -2sin((x+y)/2)*sin((x-y)2)

N = -(sin7A - sinA) + sin5A - sin3A
    = -2cos4A*sin3A + 2cos4A*sinA
    = 2cos4A(sinA - sin3A)
    = 2cos4A*2cos(2A)sin(-A)
    = -4cos4A*cos2A*sinA

D = cos7A + cosA - (cos5A + cos3A)
   = 2cos4A*cos3A - 2cos4A*cosA
   = 2cos4A(cos3A - cosA)
   = 2cos4A*(-2)sin2A*sinA
   = -4cos4A*sin2A*sinA

Therefore
N/D = [-4cos4A*cos2A*sinA]/[-4cos4A*sin2A*sinA]
       = cos2A/sin2A
      = cot2A

This verifies the identity.
4 0
3 years ago
Help me plsss i am soo bad at this
lara [203]

Step-by-step explanation:

GIVEN: O is the mid point of AC & BD.

Therefore, AO = CO & BO = DO

\therefore \: AO   \: \cong \: CO.. (given) \\  \\  \:  \:  \:  \:  \angle \: AOB  \: \cong \:\angle \:COD\\..(vertically\:opposite\:angles) \:  \\  \\  \& \: \:  \:   BO  \: \cong \: DO.. (given)  \\  \\  \therefore \triangle \: AOB  \:  \cong \:  \triangle \:COD  \\ ..(by \: SAS \: test  \: of  \: congruence ) \\  \\   \therefore AB =  CD.. \\ (Corresponding  \: sides  \: of  \: congruent  \: triangles)

8 0
3 years ago
Other questions:
  • Suppose the time to complete a 200-meter backstroke swim for female competitive swimmers is normally distributed with a mean μ =
    5·1 answer
  • I'm in 7th grade and need help have a final tomorrow
    9·1 answer
  • Please answer this correctly without making mistakes
    10·1 answer
  • Today, Barry wants to write at least 50 pages of his research paper. Barry wrote 18 pages this morning. Barry averages about 8 p
    6·2 answers
  • The Map of a biking trail is drawn on a coordinate grid
    9·1 answer
  • Please please please help me with these two problems it's urgent
    10·1 answer
  • Adam writes 18y to simplify an expression with three like terms. What could the expression be?
    12·1 answer
  • Evaluate the following expression.<br> (-5+7 x 1)-9x5
    10·2 answers
  • HELP ALERT ALERT MATH PROBLEM
    6·1 answer
  • HEEEELPPPPPP
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!