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stepan [7]
3 years ago
8

Helppppp with 4A and 4B and 5 10 points!!!!!!

Mathematics
1 answer:
Arisa [49]3 years ago
5 0
4a is humpback whales, 4b is I DON'T KNOW, 
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I need help? With proof for this one.
Schach [20]

Answer:

See below.

Step-by-step explanation:

ABC is an isosceles triangle with BA = BC.

That makes angles A and C congruent.

ABD is an isosceles triangle with AB = AD.

That makes angles ABD and ADB congruent.

Since m<ABD = 72 deg, then m<ADB = 72 deg.

Angles ADB and CDB are a linear pair which makes them supplementary.

m<ADB + m<BDC = 180 deg

72 deg + m<BDC = 180 deg

m<CDB = 108 deg

In triangle ABD, the sum of the measures of the angles is 180 deg.

m<A + m<ADB + m<ABD = 180 deg

m<A + 72 deg + 72 deg = 180 deg

m<A = 36 deg

m<C = 36 deg

In triangle BCD, the sum of the measures of the angles is 180 deg.

m<CBD + m<C + m<BDC = 180 deg

m<CBD + 36 deg + 108 deg = 180 deg

m<CBD = 36 deg

In triangle CBD, angles C and CBD measure 36 deg making them congruent.

Opposite sides DB and DC are congruent making triangle BCD isosceles.

3 0
3 years ago
Determine whether y varies directly with x. If so, find the constant of variation and write the equation.
kotykmax [81]

Answer: B. No

Step-by-step explanation:

Direct variation has the following form:

y=kx

Where the constant of variation is "k".

By definition, in direct variation, when the variable "x" changes, tha variable "y" changes in proportion to the variable "x".

As you can observe in the table, when the value of the variable "x" increase, the values of the variable "y" decrease, therefore we can conclude that it is not a direct variation.

Then the answer is the option B.

6 0
3 years ago
Having some trouble here
icang [17]

Answer:

None of them are correct i believe

Step-by-step explanation:

its sideways lol

8 0
1 year ago
What is the unemployment rate of this economy?
Ulleksa [173]
I believe the answer would be 6.5%
4 0
3 years ago
Read 2 more answers
To which set or sets does the number 37 belong? Explain.
docker41 [41]
37 is a whole number , interger and rational number
4 0
3 years ago
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