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Sophie [7]
3 years ago
12

HELP! ASAP!HELP!

Mathematics
1 answer:
Anna [14]3 years ago
8 0
C) 65

The lines mean that they are equal or same congruent whatever. Since the top angle is 50 we can subtract 50 from 180.

180 - 50 = 130

Now the other Angles are equal so divide 130 by 2 and you get 65.
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Find the numbers a, b and c if the polynomial x3−18x2+24xb−c is the cube of the binomial x+2a.
mojhsa [17]

Answer:

a=-3\\ \\b=\dfrac{9}{2}\\ \\c=216

Step-by-step explanation:

Use formula

(u+v)^3=u^3+3u^2v+3uv^2+v^3.

Hence,

(x+2a)^3=x^3+3x^2\cdot 2a+3x\cdot (2a)^2+(2a)^3=x^3+6ax^2+12a^2x+8a^3.

This expression is equal to

x^3-18x^2+24bx-c,

so we can equate the coefficients at powers of x:

x^3:\ 1=1\\ \\x^2:\ 6a=-18\Rightarrow a=-3\\ \\x:\ 12a^2=24b\Rightarrow b=\dfrac{9}{2}\\ \\1=x^0:\ 8a^3=-c\Rightarrow c=-8\cdot (-3)^3=216.

6 0
3 years ago
What is the sum of the first 14 terms of the sequence an = 6n -12
mina [271]
When n = 1  first term  = -6 
n = 2  second term =  0
n = 3 third term = 6

n = 4 4th term = 12

so we have an Arithmetic sequence  first term = -6 and common difference = 6

Sum 14 terms  =  (14/2)[2*-6 + (14-1)*6]

 =  462  answer
6 0
3 years ago
What equation would help determine the cost of 4 markers if five markers are $6.55 and remember I am asking for the equation not
harkovskaia [24]

Answer:

4($6.55)/5

Step-by-step explanation:

If five markers cost $6.55

then equate or cross multiply inorder to get the cost of 4 markers.

4($6.55)/5

7 0
2 years ago
WORTH 20 POINTS!!!!!
garik1379 [7]

Answer:

circumference = 43.98

Step-by-step explanation:

C=2πr=2·π·7≈43.9823

Brainliest?

5 0
3 years ago
Branson and his sister Beatrice combined their allowance of $7 each, so they could buy a movie for $12. They bought $1 container
Andreyy89

Answer:

Step-by-step explanation:

Branson and his sister Beatrice combined their allowance of $7 each. This means that the total amount they had is 7 + 7 = $14

They bought a movie for $12. The amount that they have left is

14 - 12 = $2

They bought $1 containers of fruit salad with the remaining money and split the containers evenly between them. This means that the number of containers that they bought is

2/1 = 2

If they split the containers evenly between themselves, then each person would get

2/2 = 1 container of fruit salad

6 0
3 years ago
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